400401836585 has 4 divisors (see below), whose sum is σ = 480482203908. Its totient is φ = 320321469264.

The previous prime is 400401836537. The next prime is 400401836603. The reversal of 400401836585 is 585638104004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 112973965456 + 287427871129 = 336116^2 + 536123^2 .

It is a cyclic number.

It is not a de Polignac number, because 400401836585 - 2⁶ = 400401836521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40040183654 + ... + 40040183663.

It is an arithmetic number, because the mean of its divisors is an integer number (120120550977).

Almost surely, 2^400401836585 is an apocalyptic number.

It is an amenable number.

400401836585 is a deficient number, since it is larger than the sum of its proper divisors (80080367323).

400401836585 is an equidigital number, since it uses as much as digits as its factorization.

400401836585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80080367322.

The product of its (nonzero) digits is 460800, while the sum is 44.

The spelling of 400401836585 in words is "four hundred billion, four hundred one million, eight hundred thirty-six thousand, five hundred eighty-five".