18689031 has 12 divisors (see below), whose sum is σ = 27244360. Its totient is φ = 12344400.

The previous prime is 18689023. The next prime is 18689051. The reversal of 18689031 is 13098681.

It is not a de Polignac number, because 18689031 - 2³ = 18689023 is a prime.

It is a super-2 number, since 2×18689031² = 698559759437922, 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 (18689051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8545 + ... + 10506.

Almost surely, 2^18689031 is an apocalyptic number.

18689031 is a deficient number, since it is larger than the sum of its proper divisors (8555329).

18689031 is a wasteful number, since it uses less digits than its factorization.

18689031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19166 (or 19163 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18689031 is about 4323.0811928531. The cubic root of 18689031 is about 265.3763774865.

The spelling of 18689031 in words is "eighteen million, six hundred eighty-nine thousand, thirty-one".