400915457 has 2 divisors, whose sum is σ = 400915458. Its totient is φ = 400915456.

The previous prime is 400915439. The next prime is 400915469. The reversal of 400915457 is 754519004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 395174641 + 5740816 = 19879^2 + 2396^2 .

It is a cyclic number.

It is not a de Polignac number, because 400915457 - 2⁶ = 400915393 is a prime.

It is not a weakly prime, because it can be changed into another prime (400915477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200457728 + 200457729.

It is an arithmetic number, because the mean of its divisors is an integer number (200457729).

Almost surely, 2^400915457 is an apocalyptic number.

It is an amenable number.

400915457 is a deficient number, since it is larger than the sum of its proper divisors (1).

400915457 is an equidigital number, since it uses as much as digits as its factorization.

400915457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 400915457 is about 20022.8733452519. The cubic root of 400915457 is about 737.3679668646.

The spelling of 400915457 in words is "four hundred million, nine hundred fifteen thousand, four hundred fifty-seven".