18212157 has 12 divisors (see below), whose sum is σ = 26476060. Its totient is φ = 12063168.

The previous prime is 18212147. The next prime is 18212189. The reversal of 18212157 is 75121281.

It can be written as a sum of positive squares in 2 ways, for example, as 8608356 + 9603801 = 2934^2 + 3099^2 .

It is not a de Polignac number, because 18212157 - 2⁶ = 18212093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18212157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18212147) 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, 5032 + ... + 7857.

Almost surely, 2^18212157 is an apocalyptic number.

It is an amenable number.

18212157 is a deficient number, since it is larger than the sum of its proper divisors (8263903).

18212157 is a wasteful number, since it uses less digits than its factorization.

18212157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13052 (or 13049 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 18212157 is about 4267.5703860628. The cubic root of 18212157 is about 263.0997660122.

The spelling of 18212157 in words is "eighteen million, two hundred twelve thousand, one hundred fifty-seven".