18849931 has 4 divisors (see below), whose sum is σ = 18882000. Its totient is φ = 18817864.

The previous prime is 18849899. The next prime is 18849959. The reversal of 18849931 is 13994881.

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

It is a cyclic number.

It is not a de Polignac number, because 18849931 - 2⁵ = 18849899 is a prime.

It is a super-2 number, since 2×18849931² = 710639797409522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18849031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15136 + ... + 16333.

It is an arithmetic number, because the mean of its divisors is an integer number (4720500).

Almost surely, 2^18849931 is an apocalyptic number.

18849931 is a deficient number, since it is larger than the sum of its proper divisors (32069).

18849931 is an equidigital number, since it uses as much as digits as its factorization.

18849931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32068.

The product of its digits is 62208, while the sum is 43.

The square root of 18849931 is about 4341.6507229394. The cubic root of 18849931 is about 266.1357731118.

The spelling of 18849931 in words is "eighteen million, eight hundred forty-nine thousand, nine hundred thirty-one".