18918957 has 8 divisors (see below), whose sum is σ = 25762176. Its totient is φ = 12344192.

The previous prime is 18918947. The next prime is 18918961. The reversal of 18918957 is 75981981.

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

It is a cyclic number.

It is not a de Polignac number, because 18918957 - 2⁷ = 18918829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18918947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66948 + ... + 67229.

It is an arithmetic number, because the mean of its divisors is an integer number (3220272).

Almost surely, 2^18918957 is an apocalyptic number.

It is an amenable number.

18918957 is a deficient number, since it is larger than the sum of its proper divisors (6843219).

18918957 is a wasteful number, since it uses less digits than its factorization.

18918957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134227.

The product of its digits is 181440, while the sum is 48.

The square root of 18918957 is about 4349.5927395562. The cubic root of 18918957 is about 266.4602289445.

The spelling of 18918957 in words is "eighteen million, nine hundred eighteen thousand, nine hundred fifty-seven".