401339988 has 144 divisors (see below), whose sum is σ = 1219982400. Its totient is φ = 113762880.

The previous prime is 401339977. The next prime is 401339989. The reversal of 401339988 is 889933104.

It is a super-2 number, since 2×401339988² = 322147571935680288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401339989) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 957643 + ... + 958061.

It is an arithmetic number, because the mean of its divisors is an integer number (8472100).

Almost surely, 2^401339988 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 401339988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (609991200).

401339988 is an abundant number, since it is smaller than the sum of its proper divisors (818642412).

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

401339988 is a wasteful number, since it uses less digits than its factorization.

401339988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 401339988 is about 20033.4716911473. The cubic root of 401339988 is about 737.6281423607.

The spelling of 401339988 in words is "four hundred one million, three hundred thirty-nine thousand, nine hundred eighty-eight".