401387988 has 24 divisors (see below), whose sum is σ = 961885792. Its totient is φ = 130179744.

The previous prime is 401387981. The next prime is 401387993. The reversal of 401387988 is 889783104.

It is a super-2 number, since 2×401387988² = 322224633821376288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401387981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 451570 + ... + 452457.

Almost surely, 2^401387988 is an apocalyptic number.

It is an amenable number.

401387988 is an abundant number, since it is smaller than the sum of its proper divisors (560497804).

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

401387988 is a wasteful number, since it uses less digits than its factorization.

401387988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904071 (or 904069 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 401387988 is about 20034.6696503836. The cubic root of 401387988 is about 737.6575478029.

The spelling of 401387988 in words is "four hundred one million, three hundred eighty-seven thousand, nine hundred eighty-eight".