18997534 has 16 divisors (see below), whose sum is σ = 30291408. Its totient is φ = 8904832.

The previous prime is 18997481. The next prime is 18997543. The reversal of 18997534 is 43579981.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9009 + ... + 10915.

It is an arithmetic number, because the mean of its divisors is an integer number (1893213).

Almost surely, 2^18997534 is an apocalyptic number.

18997534 is a deficient number, since it is larger than the sum of its proper divisors (11293874).

18997534 is a wasteful number, since it uses less digits than its factorization.

18997534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2219.

The product of its digits is 272160, while the sum is 46.

The square root of 18997534 is about 4358.6160647618. The cubic root of 18997534 is about 266.8286200245.

The spelling of 18997534 in words is "eighteen million, nine hundred ninety-seven thousand, five hundred thirty-four".