401561808 has 80 divisors (see below), whose sum is σ = 1100881920. Its totient is φ = 125774208.

The previous prime is 401561791. The next prime is 401561929. The reversal of 401561808 is 808165104.

It is a super-2 number, since 2×401561808² = 322503771288457728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114091 + ... + 117557.

It is an arithmetic number, because the mean of its divisors is an integer number (13761024).

Almost surely, 2^401561808 is an apocalyptic number.

401561808 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401561808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (550440960).

401561808 is an abundant number, since it is smaller than the sum of its proper divisors (699320112).

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

401561808 is a wasteful number, since it uses less digits than its factorization.

401561808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3624 (or 3618 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 401561808 is about 20039.0071610347. The cubic root of 401561808 is about 737.7640126489.

The spelling of 401561808 in words is "four hundred one million, five hundred sixty-one thousand, eight hundred eight".