18157522 has 4 divisors (see below), whose sum is σ = 27236286. Its totient is φ = 9078760.

The previous prime is 18157507. The next prime is 18157523. The reversal of 18157522 is 22575181.

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

It can be written as a sum of positive squares in only one way, i.e., 16719921 + 1437601 = 4089^2 + 1199^2 .

It is not an unprimeable number, because it can be changed into a prime (18157523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4539379 + ... + 4539382.

Almost surely, 2^18157522 is an apocalyptic number.

18157522 is a deficient number, since it is larger than the sum of its proper divisors (9078764).

18157522 is an equidigital number, since it uses as much as digits as its factorization.

18157522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9078763.

The product of its digits is 5600, while the sum is 31.

The square root of 18157522 is about 4261.1643948573. The cubic root of 18157522 is about 262.8364098048.

The spelling of 18157522 in words is "eighteen million, one hundred fifty-seven thousand, five hundred twenty-two".