118721915 has 8 divisors (see below), whose sum is σ = 153425328. Its totient is φ = 87671520.

The previous prime is 118721903. The next prime is 118721927. The reversal of 118721915 is 519127811.

It is an interprime number because it is at equal distance from previous prime (118721903) and next prime (118721927).

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

It is not a de Polignac number, because 118721915 - 2⁶ = 118721851 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 913181 + ... + 913310.

It is an arithmetic number, because the mean of its divisors is an integer number (19178166).

Almost surely, 2^118721915 is an apocalyptic number.

118721915 is a deficient number, since it is larger than the sum of its proper divisors (34703413).

118721915 is a wasteful number, since it uses less digits than its factorization.

118721915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826509.

The product of its digits is 5040, while the sum is 35.

The square root of 118721915 is about 10895.9586544737. The cubic root of 118721915 is about 491.4850338698.

The spelling of 118721915 in words is "one hundred eighteen million, seven hundred twenty-one thousand, nine hundred fifteen".