400405244 has 12 divisors (see below), whose sum is σ = 701229144. Its totient is φ = 200054064.

The previous prime is 400405237. The next prime is 400405249. The reversal of 400405244 is 442504004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400405249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30962 + ... + 41945.

It is an arithmetic number, because the mean of its divisors is an integer number (58435762).

Almost surely, 2^400405244 is an apocalyptic number.

It is an amenable number.

400405244 is a deficient number, since it is larger than the sum of its proper divisors (300823900).

400405244 is a wasteful number, since it uses less digits than its factorization.

400405244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74284 (or 74282 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 23.

The square root of 400405244 is about 20010.1285353193. The cubic root of 400405244 is about 737.0550376908.

Adding to 400405244 its reverse (442504004), we get a palindrome (842909248).

The spelling of 400405244 in words is "four hundred million, four hundred five thousand, two hundred forty-four".