400590857 has 2 divisors, whose sum is σ = 400590858. Its totient is φ = 400590856.

The previous prime is 400590847. The next prime is 400590863. The reversal of 400590857 is 758095004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399160441 + 1430416 = 19979^2 + 1196^2 .

It is a cyclic number.

It is not a de Polignac number, because 400590857 - 2¹² = 400586761 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400590857.

It is not a weakly prime, because it can be changed into another prime (400590847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200295428 + 200295429.

It is an arithmetic number, because the mean of its divisors is an integer number (200295429).

Almost surely, 2^400590857 is an apocalyptic number.

It is an amenable number.

400590857 is a deficient number, since it is larger than the sum of its proper divisors (1).

400590857 is an equidigital number, since it uses as much as digits as its factorization.

400590857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 400590857 is about 20014.7659741502. The cubic root of 400590857 is about 737.1689105439.

The spelling of 400590857 in words is "four hundred million, five hundred ninety thousand, eight hundred fifty-seven".