400244240 has 40 divisors (see below), whose sum is σ = 1015167168. Its totient is φ = 145543040.

The previous prime is 400244239. The next prime is 400244261. The reversal of 400244240 is 42442004.

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

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 226532 + ... + 228291.

Almost surely, 2^400244240 is an apocalyptic number.

400244240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400244240 is an abundant number, since it is smaller than the sum of its proper divisors (614922928).

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

400244240 is a wasteful number, since it uses less digits than its factorization.

400244240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454847 (or 454841 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 400244240 is about 20006.1050682036. The cubic root of 400244240 is about 736.9562338578.

Adding to 400244240 its reverse (42442004), we get a palindrome (442686244).

The spelling of 400244240 in words is "four hundred million, two hundred forty-four thousand, two hundred forty".