1312440420 has 48 divisors (see below), whose sum is σ = 3710528640. Its totient is φ = 346584576.

The previous prime is 1312440419. The next prime is 1312440439. The reversal of 1312440420 is 240442131.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100005 + ... + 112364.

It is an arithmetic number, because the mean of its divisors is an integer number (77302680).

Almost surely, 2^1312440420 is an apocalyptic number.

1312440420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312440420 is an abundant number, since it is smaller than the sum of its proper divisors (2398088220).

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

1312440420 is a wasteful number, since it uses less digits than its factorization.

1312440420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212484 (or 212482 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1312440420 is about 36227.6195740211. The cubic root of 1312440420 is about 1094.8632176260.

Adding to 1312440420 its reverse (240442131), we get a palindrome (1552882551).

The spelling of 1312440420 in words is "one billion, three hundred twelve million, four hundred forty thousand, four hundred twenty".