400121288 has 32 divisors (see below), whose sum is σ = 858211200. Its totient is φ = 171318912.

The previous prime is 400121287. The next prime is 400121311. The reversal of 400121288 is 882121004.

It is a super-2 number, since 2×400121288² = 320194090221557888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400121287) 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, 71156 + ... + 76572.

It is an arithmetic number, because the mean of its divisors is an integer number (26819100).

Almost surely, 2^400121288 is an apocalyptic number.

It is an amenable number.

400121288 is an abundant number, since it is smaller than the sum of its proper divisors (458089912).

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

400121288 is a wasteful number, since it uses less digits than its factorization.

400121288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6749 (or 6745 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 400121288 is about 20003.0319701789. The cubic root of 400121288 is about 736.8807636710.

The spelling of 400121288 in words is "four hundred million, one hundred twenty-one thousand, two hundred eighty-eight".