400120312 has 16 divisors (see below), whose sum is σ = 768524400. Its totient is φ = 195180480.

The previous prime is 400120307. The next prime is 400120321. The reversal of 400120312 is 213021004.

It is a junction number, because it is equal to n+sod(n) for n = 400120292 and 400120301.

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, 609612 + ... + 610267.

It is an arithmetic number, because the mean of its divisors is an integer number (48032775).

Almost surely, 2^400120312 is an apocalyptic number.

It is an amenable number.

400120312 is a deficient number, since it is larger than the sum of its proper divisors (368404088).

400120312 is a wasteful number, since it uses less digits than its factorization.

400120312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219926 (or 1219922 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 400120312 is about 20003.0075738625. The cubic root of 400120312 is about 736.8801645225.

Adding to 400120312 its reverse (213021004), we get a palindrome (613141316).

The spelling of 400120312 in words is "four hundred million, one hundred twenty thousand, three hundred twelve".