18404497 has 2 divisors, whose sum is σ = 18404498. Its totient is φ = 18404496.

The previous prime is 18404471. The next prime is 18404509. The reversal of 18404497 is 79440481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11350161 + 7054336 = 3369^2 + 2656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18404497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18404467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9202248 + 9202249.

It is an arithmetic number, because the mean of its divisors is an integer number (9202249).

Almost surely, 2^18404497 is an apocalyptic number.

It is an amenable number.

18404497 is a deficient number, since it is larger than the sum of its proper divisors (1).

18404497 is an equidigital number, since it uses as much as digits as its factorization.

18404497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 18404497 is about 4290.0462701467. The cubic root of 18404497 is about 264.0227300983.

The spelling of 18404497 in words is "eighteen million, four hundred four thousand, four hundred ninety-seven".