18799031 has 4 divisors (see below), whose sum is σ = 18820032. Its totient is φ = 18778032.

The previous prime is 18799009. The next prime is 18799043. The reversal of 18799031 is 13099781.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18799031 is a prime.

It is a super-2 number, since 2×18799031² = 706807133077922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18799091) 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, 9095 + ... + 10968.

It is an arithmetic number, because the mean of its divisors is an integer number (4705008).

Almost surely, 2^18799031 is an apocalyptic number.

18799031 is a deficient number, since it is larger than the sum of its proper divisors (21001).

18799031 is an equidigital number, since it uses as much as digits as its factorization.

18799031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21000.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 18799031 is about 4335.7849347033. The cubic root of 18799031 is about 265.8960105702.

The spelling of 18799031 in words is "eighteen million, seven hundred ninety-nine thousand, thirty-one".