18997536 has 24 divisors (see below), whose sum is σ = 49868784. Its totient is φ = 6332480.

The previous prime is 18997481. The next prime is 18997543. The reversal of 18997536 is 63579981.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98850 + ... + 99041.

It is an arithmetic number, because the mean of its divisors is an integer number (2077866).

Almost surely, 2^18997536 is an apocalyptic number.

18997536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18997536 is an abundant number, since it is smaller than the sum of its proper divisors (30871248).

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

18997536 is a wasteful number, since it uses less digits than its factorization.

18997536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197904 (or 197896 counting only the distinct ones).

The product of its digits is 408240, while the sum is 48.

The square root of 18997536 is about 4358.6162941925. The cubic root of 18997536 is about 266.8286293882.

The spelling of 18997536 in words is "eighteen million, nine hundred ninety-seven thousand, five hundred thirty-six".