18872031 has 4 divisors (see below), whose sum is σ = 25162712. Its totient is φ = 12581352.

The previous prime is 18872027. The next prime is 18872041. The reversal of 18872031 is 13027881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13027881 = 3 ⋅4342627.

It is not a de Polignac number, because 18872031 - 2² = 18872027 is a prime.

It is a super-2 number, since 2×18872031² = 712307108129922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18872031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18872041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3145336 + ... + 3145341.

It is an arithmetic number, because the mean of its divisors is an integer number (6290678).

Almost surely, 2^18872031 is an apocalyptic number.

18872031 is a deficient number, since it is larger than the sum of its proper divisors (6290681).

18872031 is an equidigital number, since it uses as much as digits as its factorization.

18872031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6290680.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 18872031 is about 4344.1950923042. The cubic root of 18872031 is about 266.2397399560.

The spelling of 18872031 in words is "eighteen million, eight hundred seventy-two thousand, thirty-one".