18409907 has 2 divisors, whose sum is σ = 18409908. Its totient is φ = 18409906.

The previous prime is 18409883. The next prime is 18409933. The reversal of 18409907 is 70990481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18409907 - 2¹⁰ = 18408883 is a prime.

It is not a weakly prime, because it can be changed into another prime (18409957) 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, 9204953 + 9204954.

It is an arithmetic number, because the mean of its divisors is an integer number (9204954).

Almost surely, 2^18409907 is an apocalyptic number.

18409907 is a deficient number, since it is larger than the sum of its proper divisors (1).

18409907 is an equidigital number, since it uses as much as digits as its factorization.

18409907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 18409907 is about 4290.6767531475. The cubic root of 18409907 is about 264.0485973820.

The spelling of 18409907 in words is "eighteen million, four hundred nine thousand, nine hundred seven".