18905157 has 14 divisors (see below), whose sum is σ = 28345862. Its totient is φ = 12602952.

The previous prime is 18905147. The next prime is 18905179. The reversal of 18905157 is 75150981.

It can be written as a sum of positive squares in only one way, i.e., 13883076 + 5022081 = 3726^2 + 2241^2 .

It is not a de Polignac number, because 18905157 - 2¹² = 18901061 is a prime.

It is a super-2 number, since 2×18905157² = 714809922389298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18905147) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 12238 + ... + 13695.

Almost surely, 2^18905157 is an apocalyptic number.

It is an amenable number.

18905157 is a deficient number, since it is larger than the sum of its proper divisors (9440705).

18905157 is an frugal number, since it uses more digits than its factorization.

18905157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25951 (or 25936 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 36.

The square root of 18905157 is about 4348.0060947519. The cubic root of 18905157 is about 266.3954254145.

The spelling of 18905157 in words is "eighteen million, nine hundred five thousand, one hundred fifty-seven".