400821386715 has 16 divisors (see below), whose sum is σ = 712571354400. Its totient is φ = 213771406176.

The previous prime is 400821386711. The next prime is 400821386723. The reversal of 400821386715 is 517683128004.

It is not a de Polignac number, because 400821386715 - 2² = 400821386711 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (400821386711) 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, 1484523520 + ... + 1484523789.

It is an arithmetic number, because the mean of its divisors is an integer number (44535709650).

Almost surely, 2^400821386715 is an apocalyptic number.

400821386715 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

400821386715 is a deficient number, since it is larger than the sum of its proper divisors (311749967685).

400821386715 is a wasteful number, since it uses less digits than its factorization.

400821386715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2969047323 (or 2969047317 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 400821386715 in words is "four hundred billion, eight hundred twenty-one million, three hundred eighty-six thousand, seven hundred fifteen".