400478774831 has 2 divisors, whose sum is σ = 400478774832. Its totient is φ = 400478774830.

The previous prime is 400478774819. The next prime is 400478774903. The reversal of 400478774831 is 138477874004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400478774831 - 2¹⁴ = 400478758447 is a prime.

It is a super-2 number, since 2×400478774831² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400478774231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200239387415 + 200239387416.

It is an arithmetic number, because the mean of its divisors is an integer number (200239387416).

Almost surely, 2^400478774831 is an apocalyptic number.

400478774831 is a deficient number, since it is larger than the sum of its proper divisors (1).

400478774831 is an equidigital number, since it uses as much as digits as its factorization.

400478774831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4214784, while the sum is 53.

The spelling of 400478774831 in words is "four hundred billion, four hundred seventy-eight million, seven hundred seventy-four thousand, eight hundred thirty-one".