118745721 has 12 divisors (see below), whose sum is σ = 171662400. Its totient is φ = 79098840.

The previous prime is 118745719. The next prime is 118745723. The reversal of 118745721 is 127547811.

118745721 is a `hidden beast` number, since 1 + 1 + 87 + 4 + 572 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (118745719) and next prime (118745723).

It is not a de Polignac number, because 118745721 - 2¹ = 118745719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (118745723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7876 + ... + 17306.

It is an arithmetic number, because the mean of its divisors is an integer number (14305200).

Almost surely, 2^118745721 is an apocalyptic number.

It is an amenable number.

118745721 is a deficient number, since it is larger than the sum of its proper divisors (52916679).

118745721 is a wasteful number, since it uses less digits than its factorization.

118745721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10836 (or 10833 counting only the distinct ones).

The product of its digits is 15680, while the sum is 36.

The square root of 118745721 is about 10897.0510230979. The cubic root of 118745721 is about 491.5178823706.

The spelling of 118745721 in words is "one hundred eighteen million, seven hundred forty-five thousand, seven hundred twenty-one".