18800031 has 4 divisors (see below), whose sum is σ = 25066712. Its totient is φ = 12533352.

The previous prime is 18800027. The next prime is 18800051. The reversal of 18800031 is 13000881.

It is a happy number.

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

It is not a de Polignac number, because 18800031 - 2² = 18800027 is a prime.

It is a super-2 number, since 2×18800031² = 706882331201922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18799980 and 18800007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18800051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3133336 + ... + 3133341.

It is an arithmetic number, because the mean of its divisors is an integer number (6266678).

Almost surely, 2^18800031 is an apocalyptic number.

18800031 is a deficient number, since it is larger than the sum of its proper divisors (6266681).

18800031 is an equidigital number, since it uses as much as digits as its factorization.

18800031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6266680.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 18800031 is about 4335.9002525427. The cubic root of 18800031 is about 265.9007251979.

The spelling of 18800031 in words is "eighteen million, eight hundred thousand, thirty-one".