400121328 has 40 divisors (see below), whose sum is σ = 1034538448. Its totient is φ = 133258752.

The previous prime is 400121311. The next prime is 400121329. The reversal of 400121328 is 823121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400121329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66876 + ... + 72612.

Almost surely, 2^400121328 is an apocalyptic number.

400121328 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

400121328 is an abundant number, since it is smaller than the sum of its proper divisors (634417120).

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

400121328 is a wasteful number, since it uses less digits than its factorization.

400121328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7201 (or 7195 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 400121328 is about 20003.0329700273. The cubic root of 400121328 is about 736.8807882262.

The spelling of 400121328 in words is "four hundred million, one hundred twenty-one thousand, three hundred twenty-eight".