400785215999 has 16 divisors (see below), whose sum is σ = 463313291520. Its totient is φ = 339591450240.

The previous prime is 400785215993. The next prime is 400785216049. The reversal of 400785215999 is 999512587004.

It is not a de Polignac number, because 400785215999 - 2³⁶ = 332065739263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400785215993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 368657 + ... + 968234.

It is an arithmetic number, because the mean of its divisors is an integer number (28957080720).

Almost surely, 2^400785215999 is an apocalyptic number.

400785215999 is a deficient number, since it is larger than the sum of its proper divisors (62528075521).

400785215999 is a wasteful number, since it uses less digits than its factorization.

400785215999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337390.

The product of its (nonzero) digits is 8164800, while the sum is 59.

The spelling of 400785215999 in words is "four hundred billion, seven hundred eighty-five million, two hundred fifteen thousand, nine hundred ninety-nine".