400000312 has 16 divisors (see below), whose sum is σ = 789474600. Its totient is φ = 189473760.

The previous prime is 400000309. The next prime is 400000333. The reversal of 400000312 is 213000004.

It is a congruent number.

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, 1315639 + ... + 1315942.

Almost surely, 2^400000312 is an apocalyptic number.

It is an amenable number.

400000312 is a deficient number, since it is larger than the sum of its proper divisors (389474288).

400000312 is a wasteful number, since it uses less digits than its factorization.

400000312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2631606 (or 2631602 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 400000312 is about 20000.0077999985. The cubic root of 400000312 is about 736.8064912977.

Adding to 400000312 its reverse (213000004), we get a palindrome (613000316).

The spelling of 400000312 in words is "four hundred million, three hundred twelve", and thus it is an aban number.