408427969 has 2 divisors, whose sum is σ = 408427970. Its totient is φ = 408427968.

The previous prime is 408427931. The next prime is 408427973. The reversal of 408427969 is 969724804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231404944 + 177023025 = 15212^2 + 13305^2 .

It is a cyclic number.

It is not a de Polignac number, because 408427969 - 2²³ = 400039361 is a prime.

It is a super-2 number, since 2×408427969² = 333626811722929922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (408427069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204213984 + 204213985.

It is an arithmetic number, because the mean of its divisors is an integer number (204213985).

Almost surely, 2^408427969 is an apocalyptic number.

It is an amenable number.

408427969 is a deficient number, since it is larger than the sum of its proper divisors (1).

408427969 is an equidigital number, since it uses as much as digits as its factorization.

408427969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 49.

The square root of 408427969 is about 20209.6009114480. The cubic root of 408427969 is about 741.9451921505.

The spelling of 408427969 in words is "four hundred eight million, four hundred twenty-seven thousand, nine hundred sixty-nine".