18408953 has 2 divisors, whose sum is σ = 18408954. Its totient is φ = 18408952.

The previous prime is 18408941. The next prime is 18408979. The reversal of 18408953 is 35980481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16949689 + 1459264 = 4117^2 + 1208^2 .

It is a cyclic number.

It is not a de Polignac number, because 18408953 - 2⁴ = 18408937 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18408983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9204476 + 9204477.

It is an arithmetic number, because the mean of its divisors is an integer number (9204477).

Almost surely, 2^18408953 is an apocalyptic number.

It is an amenable number.

18408953 is a deficient number, since it is larger than the sum of its proper divisors (1).

18408953 is an equidigital number, since it uses as much as digits as its factorization.

18408953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 18408953 is about 4290.5655804334. The cubic root of 18408953 is about 264.0440363104.

The spelling of 18408953 in words is "eighteen million, four hundred eight thousand, nine hundred fifty-three".