1620400312 has 16 divisors (see below), whose sum is σ = 3045273840. Its totient is φ = 808327296.

The previous prime is 1620400273. The next prime is 1620400321. The reversal of 1620400312 is 2130040261.

It is a super-2 number, since 2×1620400312² = 5251394342259394688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1620400312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230428 + ... + 237355.

It is an arithmetic number, because the mean of its divisors is an integer number (190329615).

Almost surely, 2^1620400312 is an apocalyptic number.

It is an amenable number.

1620400312 is a deficient number, since it is larger than the sum of its proper divisors (1424873528).

1620400312 is a wasteful number, since it uses less digits than its factorization.

1620400312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468222 (or 468218 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1620400312 is about 40254.1962036258. The cubic root of 1620400312 is about 1174.5570231795.

Adding to 1620400312 its reverse (2130040261), we get a palindrome (3750440573).

The spelling of 1620400312 in words is "one billion, six hundred twenty million, four hundred thousand, three hundred twelve".