400331812 has 12 divisors (see below), whose sum is σ = 701720460. Its totient is φ = 199840256.

The previous prime is 400331809. The next prime is 400331903. The reversal of 400331812 is 218133004.

It can be written as a sum of positive squares in 2 ways, for example, as 187580416 + 212751396 = 13696^2 + 14586^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78637 + ... + 83572.

It is an arithmetic number, because the mean of its divisors is an integer number (58476705).

Almost surely, 2^400331812 is an apocalyptic number.

It is an amenable number.

400331812 is a deficient number, since it is larger than the sum of its proper divisors (301388648).

400331812 is a wasteful number, since it uses less digits than its factorization.

400331812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162830 (or 162828 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 400331812 is about 20008.2935804131. The cubic root of 400331812 is about 737.0099777294.

Adding to 400331812 its reverse (218133004), we get a palindrome (618464816).

The spelling of 400331812 in words is "four hundred million, three hundred thirty-one thousand, eight hundred twelve".