18139417 has 2 divisors, whose sum is σ = 18139418. Its totient is φ = 18139416.

The previous prime is 18139411. The next prime is 18139463. The reversal of 18139417 is 71493181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11909401 + 6230016 = 3451^2 + 2496^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18139417 is a prime.

It is not a weakly prime, because it can be changed into another prime (18139411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9069708 + 9069709.

It is an arithmetic number, because the mean of its divisors is an integer number (9069709).

Almost surely, 2^18139417 is an apocalyptic number.

It is an amenable number.

18139417 is a deficient number, since it is larger than the sum of its proper divisors (1).

18139417 is an equidigital number, since it uses as much as digits as its factorization.

18139417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 18139417 is about 4259.0394456966. The cubic root of 18139417 is about 262.7490220414.

The spelling of 18139417 in words is "eighteen million, one hundred thirty-nine thousand, four hundred seventeen".