18407009 has 2 divisors, whose sum is σ = 18407010. Its totient is φ = 18407008.

The previous prime is 18407003. The next prime is 18407041. The reversal of 18407009 is 90070481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12780625 + 5626384 = 3575^2 + 2372^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18407009 is a prime.

It is not a weakly prime, because it can be changed into another prime (18407003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9203504 + 9203505.

It is an arithmetic number, because the mean of its divisors is an integer number (9203505).

Almost surely, 2^18407009 is an apocalyptic number.

It is an amenable number.

18407009 is a deficient number, since it is larger than the sum of its proper divisors (1).

18407009 is an equidigital number, since it uses as much as digits as its factorization.

18407009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 18407009 is about 4290.3390308925. The cubic root of 18407009 is about 264.0347415635.

The spelling of 18407009 in words is "eighteen million, four hundred seven thousand, nine".