400744240 has 40 divisors (see below), whose sum is σ = 1003404528. Its totient is φ = 147966720.

The previous prime is 400744237. The next prime is 400744259. The reversal of 400744240 is 42447004.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

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, 191626 + ... + 193705.

Almost surely, 2^400744240 is an apocalyptic number.

400744240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400744240 is an abundant number, since it is smaller than the sum of its proper divisors (602660288).

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

400744240 is a wasteful number, since it uses less digits than its factorization.

400744240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385357 (or 385351 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 25.

The square root of 400744240 is about 20018.5973534611. The cubic root of 400744240 is about 737.2629838767.

The spelling of 400744240 in words is "four hundred million, seven hundred forty-four thousand, two hundred forty".