401881840 has 40 divisors (see below), whose sum is σ = 935618688. Its totient is φ = 160538880.

The previous prime is 401881793. The next prime is 401881859. The reversal of 401881840 is 48188104.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 401881796 and 401881805.

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 7 ways as a sum of consecutive naturals, for example, 66130 + ... + 71950.

Almost surely, 2^401881840 is an apocalyptic number.

401881840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

401881840 is an abundant number, since it is smaller than the sum of its proper divisors (533736848).

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

401881840 is a wasteful number, since it uses less digits than its factorization.

401881840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6697 (or 6691 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 34.

The square root of 401881840 is about 20046.9907966258. The cubic root of 401881840 is about 737.9599520966.

It can be divided in two parts, 4018 and 81840, that added together give a palindrome (85858).

The spelling of 401881840 in words is "four hundred one million, eight hundred eighty-one thousand, eight hundred forty".