1242813877 has 4 divisors (see below), whose sum is σ = 1248289056. Its totient is φ = 1237338700.

The previous prime is 1242813857. The next prime is 1242813893. The reversal of 1242813877 is 7783182421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7783182421 = 7 ⋅1111883203.

It is a cyclic number.

It is not a de Polignac number, because 1242813877 - 2²⁷ = 1108596149 is a prime.

It is a super-2 number, since 2×1242813877² = 3089172665727542258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242813827) 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, 2737249 + ... + 2737702.

It is an arithmetic number, because the mean of its divisors is an integer number (312072264).

Almost surely, 2^1242813877 is an apocalyptic number.

It is an amenable number.

1242813877 is a deficient number, since it is larger than the sum of its proper divisors (5475179).

1242813877 is an equidigital number, since it uses as much as digits as its factorization.

1242813877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5475178.

The product of its digits is 150528, while the sum is 43.

The square root of 1242813877 is about 35253.5654508874. The cubic root of 1242813877 is about 1075.1491055481.

The spelling of 1242813877 in words is "one billion, two hundred forty-two million, eight hundred thirteen thousand, eight hundred seventy-seven".