401639280 has 400 divisors, whose sum is σ = 1575461664. Its totient is φ = 84295680.

The previous prime is 401639269. The next prime is 401639323. The reversal of 401639280 is 82936104.

It is a super-2 number, since 2×401639280² = 322628222477836800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 9796060 + ... + 9796100.

Almost surely, 2^401639280 is an apocalyptic number.

401639280 is a gapful number since it is divisible by the number (40) 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 401639280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (787730832).

401639280 is an abundant number, since it is smaller than the sum of its proper divisors (1173822384).

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

401639280 is a wasteful number, since it uses less digits than its factorization.

401639280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 401639280 is about 20040.9400977100. The cubic root of 401639280 is about 737.8114543936.

The spelling of 401639280 in words is "four hundred one million, six hundred thirty-nine thousand, two hundred eighty".