400312664 has 8 divisors (see below), whose sum is σ = 750586260. Its totient is φ = 200156328.

The previous prime is 400312663. The next prime is 400312667. The reversal of 400312664 is 466213004.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400312663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25019534 + ... + 25019549.

Almost surely, 2^400312664 is an apocalyptic number.

It is an amenable number.

400312664 is a deficient number, since it is larger than the sum of its proper divisors (350273596).

400312664 is a wasteful number, since it uses less digits than its factorization.

400312664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50039089 (or 50039085 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 400312664 is about 20007.8150731158. The cubic root of 400312664 is about 736.9982270669.

Adding to 400312664 its reverse (466213004), we get a palindrome (866525668).

The spelling of 400312664 in words is "four hundred million, three hundred twelve thousand, six hundred sixty-four".