18873031 has 4 divisors (see below), whose sum is σ = 18900000. Its totient is φ = 18846064.

The previous prime is 18872993. The next prime is 18873053. The reversal of 18873031 is 13037881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13037881 = 163 ⋅79987.

It is a cyclic number.

It is not a de Polignac number, because 18873031 - 2²³ = 10484423 is a prime.

It is a super-2 number, since 2×18873031² = 712382598253922, 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 = 18872984 and 18873002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18873131) 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, 12406 + ... + 13843.

It is an arithmetic number, because the mean of its divisors is an integer number (4725000).

Almost surely, 2^18873031 is an apocalyptic number.

18873031 is a deficient number, since it is larger than the sum of its proper divisors (26969).

18873031 is an equidigital number, since it uses as much as digits as its factorization.

18873031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26968.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18873031 is about 4344.3101868996. The cubic root of 18873031 is about 266.2444424182.

The spelling of 18873031 in words is "eighteen million, eight hundred seventy-three thousand, thirty-one".