400287880 has 32 divisors (see below), whose sum is σ = 903231000. Its totient is φ = 159655936.

The previous prime is 400287857. The next prime is 400287887. The reversal of 400287880 is 88782004.

It can be written as a sum of positive squares in 4 ways, for example, as 191600964 + 208686916 = 13842^2 + 14446^2 .

It is not an unprimeable number, because it can be changed into a prime (400287887) 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, 55 + ... + 28294.

Almost surely, 2^400287880 is an apocalyptic number.

400287880 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400287880 is an abundant number, since it is smaller than the sum of its proper divisors (502943120).

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

400287880 is a wasteful number, since it uses less digits than its factorization.

400287880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28713 (or 28709 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 37.

The square root of 400287880 is about 20007.1957055455. The cubic root of 400287880 is about 736.9830171716.

The spelling of 400287880 in words is "four hundred million, two hundred eighty-seven thousand, eight hundred eighty".