18157907 has 4 divisors (see below), whose sum is σ = 18263040. Its totient is φ = 18052776.

The previous prime is 18157891. The next prime is 18157927. The reversal of 18157907 is 70975181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18157907 - 2⁴ = 18157891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18157927) 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, 52307 + ... + 52652.

It is an arithmetic number, because the mean of its divisors is an integer number (4565760).

Almost surely, 2^18157907 is an apocalyptic number.

18157907 is a deficient number, since it is larger than the sum of its proper divisors (105133).

18157907 is a wasteful number, since it uses less digits than its factorization.

18157907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105132.

The product of its (nonzero) digits is 17640, while the sum is 38.

The square root of 18157907 is about 4261.2095700634. The cubic root of 18157907 is about 262.8382674610.

The spelling of 18157907 in words is "eighteen million, one hundred fifty-seven thousand, nine hundred seven".