402401390646 has 32 divisors (see below), whose sum is σ = 854290666080. Its totient is φ = 125925566976.

The previous prime is 402401390623. The next prime is 402401390647. The reversal of 402401390646 is 646093104204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402401390647) 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 15 ways as a sum of consecutive naturals, for example, 4928161 + ... + 5009148.

It is an arithmetic number, because the mean of its divisors is an integer number (26696583315).

Almost surely, 2^402401390646 is an apocalyptic number.

402401390646 is an abundant number, since it is smaller than the sum of its proper divisors (451889275434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402401390646 is a wasteful number, since it uses less digits than its factorization.

402401390646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9937728.

The product of its (nonzero) digits is 124416, while the sum is 39.

The spelling of 402401390646 in words is "four hundred two billion, four hundred one million, three hundred ninety thousand, six hundred forty-six".