401863980 has 96 divisors (see below), whose sum is σ = 1289433600. Its totient is φ = 91607040.

The previous prime is 401863963. The next prime is 401864081. The reversal of 401863980 is 89368104.

It is a super-2 number, since 2×401863980² = 322989316842880800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187515 + ... + 189645.

It is an arithmetic number, because the mean of its divisors is an integer number (13431600).

Almost surely, 2^401863980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401863980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (644716800).

401863980 is an abundant number, since it is smaller than the sum of its proper divisors (887569620).

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

401863980 is a wasteful number, since it uses less digits than its factorization.

401863980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2599 (or 2597 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 401863980 is about 20046.5453382871. The cubic root of 401863980 is about 737.9490200608.

The spelling of 401863980 in words is "four hundred one million, eight hundred sixty-three thousand, nine hundred eighty".