1312001992 has 64 divisors (see below), whose sum is σ = 2970432000. Its totient is φ = 531315456.

The previous prime is 1312001983. The next prime is 1312001993. The reversal of 1312001992 is 2991002131.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 1312001992.

It is not an unprimeable number, because it can be changed into a prime (1312001993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67734 + ... + 84922.

It is an arithmetic number, because the mean of its divisors is an integer number (46413000).

Almost surely, 2^1312001992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1312001992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1485216000).

1312001992 is an abundant number, since it is smaller than the sum of its proper divisors (1658430008).

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

1312001992 is a wasteful number, since it uses less digits than its factorization.

1312001992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17278 (or 17274 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 1312001992 is about 36221.5680499892. The cubic root of 1312001992 is about 1094.7412890050.

The spelling of 1312001992 in words is "one billion, three hundred twelve million, one thousand, nine hundred ninety-two".