1311899976 has 80 divisors (see below), whose sum is σ = 3690729900. Its totient is φ = 435373056.

The previous prime is 1311899969. The next prime is 1311899983. The reversal of 1311899976 is 6799981131.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1311899969) and next prime (1311899983).

It can be written as a sum of positive squares in 2 ways, for example, as 1305087876 + 6812100 = 36126^2 + 2610^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 146640 + ... + 155328.

Almost surely, 2^1311899976 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 1311899976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1845364950).

1311899976 is an abundant number, since it is smaller than the sum of its proper divisors (2378829924).

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

1311899976 is a wasteful number, since it uses less digits than its factorization.

1311899976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8940 (or 8927 counting only the distinct ones).

The product of its digits is 734832, while the sum is 54.

The square root of 1311899976 is about 36220.1598008623. The cubic root of 1311899976 is about 1094.7129140425.

The spelling of 1311899976 in words is "one billion, three hundred eleven million, eight hundred ninety-nine thousand, nine hundred seventy-six".