18531934 has 4 divisors (see below), whose sum is σ = 27797904. Its totient is φ = 9265966.

The previous prime is 18531917. The next prime is 18531937. The reversal of 18531934 is 43913581.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18531934.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18531937) by changing a digit.

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, 4632982 + ... + 4632985.

It is an arithmetic number, because the mean of its divisors is an integer number (6949476).

Almost surely, 2^18531934 is an apocalyptic number.

18531934 is a deficient number, since it is larger than the sum of its proper divisors (9265970).

18531934 is an equidigital number, since it uses as much as digits as its factorization.

18531934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9265969.

The product of its digits is 12960, while the sum is 34.

The square root of 18531934 is about 4304.8732850108. The cubic root of 18531934 is about 264.6307138217.

The spelling of 18531934 in words is "eighteen million, five hundred thirty-one thousand, nine hundred thirty-four".