406371400721 has 32 divisors (see below), whose sum is σ = 503086550400. Its totient is φ = 322713262080.

The previous prime is 406371400717. The next prime is 406371400769. The reversal of 406371400721 is 127004173604.

It is not a de Polignac number, because 406371400721 - 2² = 406371400717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406371400711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2443595 + ... + 2604591.

It is an arithmetic number, because the mean of its divisors is an integer number (15721454700).

Almost surely, 2^406371400721 is an apocalyptic number.

It is an amenable number.

406371400721 is a deficient number, since it is larger than the sum of its proper divisors (96715149679).

406371400721 is a wasteful number, since it uses less digits than its factorization.

406371400721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161969.

The product of its (nonzero) digits is 28224, while the sum is 35.

The spelling of 406371400721 in words is "four hundred six billion, three hundred seventy-one million, four hundred thousand, seven hundred twenty-one".