400636417640 has 32 divisors (see below), whose sum is σ = 940624634880. Its totient is φ = 153286976832.

The previous prime is 400636417637. The next prime is 400636417669. The reversal of 400636417640 is 46714636004.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217736264 + ... + 217738103.

It is an arithmetic number, because the mean of its divisors is an integer number (29394519840).

Almost surely, 2^400636417640 is an apocalyptic number.

400636417640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400636417640 is an abundant number, since it is smaller than the sum of its proper divisors (539988217240).

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

400636417640 is a wasteful number, since it uses less digits than its factorization.

400636417640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435474401 (or 435474397 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 41.

The spelling of 400636417640 in words is "four hundred billion, six hundred thirty-six million, four hundred seventeen thousand, six hundred forty".