400642644646 has 8 divisors (see below), whose sum is σ = 612302909904. Its totient is φ = 196541674680.

The previous prime is 400642644631. The next prime is 400642644667. The reversal of 400642644646 is 646446246004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 400642644596 and 400642644605.

It is a congruent 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, 1889823690 + ... + 1889823901.

It is an arithmetic number, because the mean of its divisors is an integer number (76537863738).

Almost surely, 2^400642644646 is an apocalyptic number.

400642644646 is a deficient number, since it is larger than the sum of its proper divisors (211660265258).

400642644646 is a wasteful number, since it uses less digits than its factorization.

400642644646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3779647646.

The product of its (nonzero) digits is 2654208, while the sum is 46.

The spelling of 400642644646 in words is "four hundred billion, six hundred forty-two million, six hundred forty-four thousand, six hundred forty-six".