18557372 has 6 divisors (see below), whose sum is σ = 32475408. Its totient is φ = 9278684.

The previous prime is 18557351. The next prime is 18557393. The reversal of 18557372 is 27375581.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18557351) and next prime (18557393).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2319668 + ... + 2319675.

It is an arithmetic number, because the mean of its divisors is an integer number (5412568).

Almost surely, 2^18557372 is an apocalyptic number.

It is an amenable number.

18557372 is a deficient number, since it is larger than the sum of its proper divisors (13918036).

18557372 is a wasteful number, since it uses less digits than its factorization.

18557372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4639347 (or 4639345 counting only the distinct ones).

The product of its digits is 58800, while the sum is 38.

The square root of 18557372 is about 4307.8268303171. The cubic root of 18557372 is about 264.7517409157.

The spelling of 18557372 in words is "eighteen million, five hundred fifty-seven thousand, three hundred seventy-two".