18931742 has 4 divisors (see below), whose sum is σ = 28397616. Its totient is φ = 9465870.

The previous prime is 18931699. The next prime is 18931819. The reversal of 18931742 is 24713981.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4732934 + ... + 4732937.

It is an arithmetic number, because the mean of its divisors is an integer number (7099404).

Almost surely, 2^18931742 is an apocalyptic number.

18931742 is a deficient number, since it is larger than the sum of its proper divisors (9465874).

18931742 is an equidigital number, since it uses as much as digits as its factorization.

18931742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9465873.

The product of its digits is 12096, while the sum is 35.

The square root of 18931742 is about 4351.0621691720. The cubic root of 18931742 is about 266.5202380124.

The spelling of 18931742 in words is "eighteen million, nine hundred thirty-one thousand, seven hundred forty-two".