1312044440 has 32 divisors (see below), whose sum is σ = 3373829280. Its totient is φ = 449843712.

The previous prime is 1312044431. The next prime is 1312044443. The reversal of 1312044440 is 444402131.

It is a happy number.

It is a super-2 number, since 2×1312044440² = 3442921225069827200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312044443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2342657 + ... + 2343216.

It is an arithmetic number, because the mean of its divisors is an integer number (105432165).

Almost surely, 2^1312044440 is an apocalyptic number.

1312044440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312044440 is an abundant number, since it is smaller than the sum of its proper divisors (2061784840).

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

1312044440 is a wasteful number, since it uses less digits than its factorization.

1312044440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4685891 (or 4685887 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1312044440 is about 36222.1539944824. The cubic root of 1312044440 is about 1094.7530951551.

Adding to 1312044440 its reverse (444402131), we get a palindrome (1756446571).

The spelling of 1312044440 in words is "one billion, three hundred twelve million, forty-four thousand, four hundred forty".