401555680 has 48 divisors (see below), whose sum is σ = 964250784. Its totient is φ = 157985280.

The previous prime is 401555677. The next prime is 401555701. The reversal of 401555680 is 86555104.

It is a happy number.

It is a super-2 number, since 2×401555680² = 322493928280524800, which contains 22 as substring.

It is a congruent number.

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, 10812 + ... + 30331.

It is an arithmetic number, because the mean of its divisors is an integer number (20088558).

Almost surely, 2^401555680 is an apocalyptic number.

401555680 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

401555680 is an abundant number, since it is smaller than the sum of its proper divisors (562695104).

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

401555680 is a wasteful number, since it uses less digits than its factorization.

401555680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41219 (or 41211 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 401555680 is about 20038.8542586646. The cubic root of 401555680 is about 737.7602597680.

It can be divided in two parts, 4015 and 55680, that added together give a palindrome (59695).

The spelling of 401555680 in words is "four hundred one million, five hundred fifty-five thousand, six hundred eighty".