118188721 has 8 divisors (see below), whose sum is σ = 142182080. Its totient is φ = 95972688.

The previous prime is 118188701. The next prime is 118188751. The reversal of 118188721 is 127881811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 118188721 - 2¹⁵ = 118155953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118188701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444186 + ... + 444451.

It is an arithmetic number, because the mean of its divisors is an integer number (17772760).

Almost surely, 2^118188721 is an apocalyptic number.

It is an amenable number.

118188721 is a deficient number, since it is larger than the sum of its proper divisors (23993359).

118188721 is an equidigital number, since it uses as much as digits as its factorization.

118188721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888663.

The product of its digits is 7168, while the sum is 37.

The square root of 118188721 is about 10871.4636089167. The cubic root of 118188721 is about 490.7481573847.

The spelling of 118188721 in words is "one hundred eighteen million, one hundred eighty-eight thousand, seven hundred twenty-one".