18198572 has 24 divisors (see below), whose sum is σ = 36610560. Its totient is φ = 7753680.

The previous prime is 18198571. The next prime is 18198601. The reversal of 18198572 is 27589181.

It is a super-3 number, since 3×18198572³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18198571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3197 + ... + 6827.

It is an arithmetic number, because the mean of its divisors is an integer number (1525440).

Almost surely, 2^18198572 is an apocalyptic number.

It is an amenable number.

18198572 is an abundant number, since it is smaller than the sum of its proper divisors (18411988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18198572 is a wasteful number, since it uses less digits than its factorization.

18198572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3821 (or 3819 counting only the distinct ones).

The product of its digits is 40320, while the sum is 41.

The square root of 18198572 is about 4265.9784340758. The cubic root of 18198572 is about 263.0343317093.

The spelling of 18198572 in words is "eighteen million, one hundred ninety-eight thousand, five hundred seventy-two".