400440324 has 48 divisors (see below), whose sum is σ = 944431488. Its totient is φ = 132050688.

The previous prime is 400440311. The next prime is 400440343. The reversal of 400440324 is 423044004.

It is a self number, because there is not a number n which added to its sum of digits gives 400440324.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 550449 + ... + 551175.

It is an arithmetic number, because the mean of its divisors is an integer number (19675656).

Almost surely, 2^400440324 is an apocalyptic number.

It is an amenable number.

400440324 is an abundant number, since it is smaller than the sum of its proper divisors (543991164).

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

400440324 is a wasteful number, since it uses less digits than its factorization.

400440324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164 (or 1162 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 400440324 is about 20011.0050722096. The cubic root of 400440324 is about 737.0765618308.

Adding to 400440324 its reverse (423044004), we get a palindrome (823484328).

The spelling of 400440324 in words is "four hundred million, four hundred forty thousand, three hundred twenty-four".