118243877 has 4 divisors (see below), whose sum is σ = 121127916. Its totient is φ = 115359840.

The previous prime is 118243871. The next prime is 118243883. The reversal of 118243877 is 778342811.

It is a Cunningham number, because it is equal to 10874²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 778342811 = 41 ⋅18983971.

It is an interprime number because it is at equal distance from previous prime (118243871) and next prime (118243883).

It can be written as a sum of positive squares in 2 ways, for example, as 5692996 + 112550881 = 2386^2 + 10609^2 .

It is a cyclic number.

It is not a de Polignac number, because 118243877 - 2²⁰ = 117195301 is a prime.

It is a super-2 number, since 2×118243877² = 27963228895982258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 2883997 = 118243877 / (1 + 1 + 8 + 2 + 4 + 3 + 8 + 7 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118243871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1441958 + ... + 1442039.

It is an arithmetic number, because the mean of its divisors is an integer number (30281979).

Almost surely, 2^118243877 is an apocalyptic number.

It is an amenable number.

118243877 is a deficient number, since it is larger than the sum of its proper divisors (2884039).

118243877 is an equidigital number, since it uses as much as digits as its factorization.

118243877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2884038.

The product of its digits is 75264, while the sum is 41.

The square root of 118243877 is about 10874.0000459812. Note that the first 4 decimals coincide. The cubic root of 118243877 is about 490.8244858634.

The spelling of 118243877 in words is "one hundred eighteen million, two hundred forty-three thousand, eight hundred seventy-seven".