18409207 has 2 divisors, whose sum is σ = 18409208. Its totient is φ = 18409206.

The previous prime is 18409201. The next prime is 18409241. The reversal of 18409207 is 70290481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18409207 - 2³ = 18409199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18409201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9204603 + 9204604.

It is an arithmetic number, because the mean of its divisors is an integer number (9204604).

Almost surely, 2^18409207 is an apocalyptic number.

18409207 is a deficient number, since it is larger than the sum of its proper divisors (1).

18409207 is an equidigital number, since it uses as much as digits as its factorization.

18409207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18409207 is about 4290.5951801586. The cubic root of 18409207 is about 264.0452506992.

Adding to 18409207 its reverse (70290481), we get a palindrome (88699688).

The spelling of 18409207 in words is "eighteen million, four hundred nine thousand, two hundred seven".