401388020 has 48 divisors (see below), whose sum is σ = 973643328. Its totient is φ = 137372160.

The previous prime is 401387993. The next prime is 401388023. The reversal of 401388020 is 20883104.

It is a super-2 number, since 2×401388020² = 322224685199040800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401388023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49922 + ... + 57401.

It is an arithmetic number, because the mean of its divisors is an integer number (20284236).

Almost surely, 2^401388020 is an apocalyptic number.

It is an amenable number.

401388020 is an abundant number, since it is smaller than the sum of its proper divisors (572255308).

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

401388020 is a wasteful number, since it uses less digits than its factorization.

401388020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107360 (or 107358 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 401388020 is about 20034.6704489992. The cubic root of 401388020 is about 737.6575674057.

The spelling of 401388020 in words is "four hundred one million, three hundred eighty-eight thousand, twenty".