401891520 has 56 divisors (see below), whose sum is σ = 1276008624. Its totient is φ = 107170816.

The previous prime is 401891519. The next prime is 401891531. The reversal of 401891520 is 25198104.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208359 + ... + 210278.

Almost surely, 2^401891520 is an apocalyptic number.

401891520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

401891520 is an abundant number, since it is smaller than the sum of its proper divisors (874117104).

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

401891520 is a wasteful number, since it uses less digits than its factorization.

401891520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418657 (or 418647 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 401891520 is about 20047.2322279162. The cubic root of 401891520 is about 737.9658770513.

The spelling of 401891520 in words is "four hundred one million, eight hundred ninety-one thousand, five hundred twenty".