400312 has 16 divisors (see below), whose sum is σ = 819000. Its totient is φ = 181920.

The previous prime is 400307. The next prime is 400313. The reversal of 400312 is 213004.

400312 is nontrivially palindromic in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400313) by changing a digit.

400312 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2187 + ... + 2362.

2⁴⁰⁰³¹² is an apocalyptic number.

It is an amenable number.

400312 is an abundant number, since it is smaller than the sum of its proper divisors (418688).

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

400312 is a wasteful number, since it uses less digits than its factorization.

400312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4566 (or 4562 counting only the distinct ones).

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

The square root of 400312 is about 632.7021416117. The cubic root of 400312 is about 73.6997819579.

Adding to 400312 its reverse (213004), we get a palindrome (613316).

The spelling of 400312 in words is "four hundred thousand, three hundred twelve", and thus it is an iban number.