18106731 has 12 divisors (see below), whose sum is σ = 26242320. Its totient is φ = 12030480.

The previous prime is 18106667. The next prime is 18106733. The reversal of 18106731 is 13760181.

It is not a de Polignac number, because 18106731 - 2⁶ = 18106667 is a prime.

It is a super-2 number, since 2×18106731² = 655707415012722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18106695 and 18106704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18106733) 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, 436 + ... + 6033.

It is an arithmetic number, because the mean of its divisors is an integer number (2186860).

Almost surely, 2^18106731 is an apocalyptic number.

18106731 is a deficient number, since it is larger than the sum of its proper divisors (8135589).

18106731 is a wasteful number, since it uses less digits than its factorization.

18106731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6786 (or 6783 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 18106731 is about 4255.2004653130. The cubic root of 18106731 is about 262.5911085105.

The spelling of 18106731 in words is "eighteen million, one hundred six thousand, seven hundred thirty-one".