18672931 has 2 divisors, whose sum is σ = 18672932. Its totient is φ = 18672930.

The previous prime is 18672923. The next prime is 18672947. The reversal of 18672931 is 13927681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18672931 - 2³ = 18672923 is a prime.

It is a super-2 number, since 2×18672931² = 697356704261522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18672131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9336465 + 9336466.

It is an arithmetic number, because the mean of its divisors is an integer number (9336466).

Almost surely, 2^18672931 is an apocalyptic number.

18672931 is a deficient number, since it is larger than the sum of its proper divisors (1).

18672931 is an equidigital number, since it uses as much as digits as its factorization.

18672931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 18672931 is about 4321.2186938409. The cubic root of 18672931 is about 265.3001511846.

The spelling of 18672931 in words is "eighteen million, six hundred seventy-two thousand, nine hundred thirty-one".