401556680 has 32 divisors (see below), whose sum is σ = 1032575040. Its totient is φ = 137676480.

The previous prime is 401556667. The next prime is 401556691. The reversal of 401556680 is 86655104.

It is a happy number.

It is a super-2 number, since 2×401556680² = 322495534505244800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 401556680.

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, 716786 + ... + 717345.

It is an arithmetic number, because the mean of its divisors is an integer number (32267970).

Almost surely, 2^401556680 is an apocalyptic number.

401556680 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

401556680 is an abundant number, since it is smaller than the sum of its proper divisors (631018360).

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

401556680 is a wasteful number, since it uses less digits than its factorization.

401556680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1434149 (or 1434145 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 401556680 is about 20038.8792101754. The cubic root of 401556680 is about 737.7608721859.

The spelling of 401556680 in words is "four hundred one million, five hundred fifty-six thousand, six hundred eighty".