400128248 has 32 divisors (see below), whose sum is σ = 810989760. Its totient is φ = 183980160.

The previous prime is 400128233. The next prime is 400128299. The reversal of 400128248 is 842821004.

It is a super-2 number, since 2×400128248² = 320205229695099008, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400128248.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21086 + ... + 35282.

It is an arithmetic number, because the mean of its divisors is an integer number (25343430).

Almost surely, 2^400128248 is an apocalyptic number.

It is an amenable number.

400128248 is an abundant number, since it is smaller than the sum of its proper divisors (410861512).

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

400128248 is a wasteful number, since it uses less digits than its factorization.

400128248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14487 (or 14483 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 400128248 is about 20003.2059430482. The cubic root of 400128248 is about 736.8850362591.

The spelling of 400128248 in words is "four hundred million, one hundred twenty-eight thousand, two hundred forty-eight".