400001312 has 24 divisors (see below), whose sum is σ = 791864892. Its totient is φ = 198892800.

The previous prime is 400001269. The next prime is 400001341. The reversal of 400001312 is 213100004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 373416976 + 26584336 = 19324^2 + 5156^2 .

It is a junction number, because it is equal to n+sod(n) for n = 400001293 and 400001302.

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, 28739 + ... + 40322.

Almost surely, 2^400001312 is an apocalyptic number.

It is an amenable number.

400001312 is a deficient number, since it is larger than the sum of its proper divisors (391863580).

400001312 is a wasteful number, since it uses less digits than its factorization.

400001312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69252 (or 69244 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 400001312 is about 20000.0327999731. The cubic root of 400001312 is about 736.8071053021.

Adding to 400001312 its reverse (213100004), we get a palindrome (613101316).

The spelling of 400001312 in words is "four hundred million, one thousand, three hundred twelve".