18272157 has 4 divisors (see below), whose sum is σ = 24362880. Its totient is φ = 12181436.

The previous prime is 18272153. The next prime is 18272159. The reversal of 18272157 is 75127281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18272157 - 2² = 18272153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18272153) 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, 3045357 + ... + 3045362.

It is an arithmetic number, because the mean of its divisors is an integer number (6090720).

Almost surely, 2^18272157 is an apocalyptic number.

It is an amenable number.

18272157 is a deficient number, since it is larger than the sum of its proper divisors (6090723).

18272157 is an equidigital number, since it uses as much as digits as its factorization.

18272157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6090722.

The product of its digits is 7840, while the sum is 33.

The square root of 18272157 is about 4274.5943667207. The cubic root of 18272157 is about 263.3883769285.

The spelling of 18272157 in words is "eighteen million, two hundred seventy-two thousand, one hundred fifty-seven".