1312404977 has 4 divisors (see below), whose sum is σ = 1413359220. Its totient is φ = 1211450736.

The previous prime is 1312404943. The next prime is 1312404991. The reversal of 1312404977 is 7794042131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 533101921 + 779303056 = 23089^2 + 27916^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312404977 - 2¹⁸ = 1312142833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1312404977.

It is not an unprimeable number, because it can be changed into a prime (1312404937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50477102 + ... + 50477127.

It is an arithmetic number, because the mean of its divisors is an integer number (353339805).

Almost surely, 2^1312404977 is an apocalyptic number.

It is an amenable number.

1312404977 is a deficient number, since it is larger than the sum of its proper divisors (100954243).

1312404977 is a wasteful number, since it uses less digits than its factorization.

1312404977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100954242.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 1312404977 is about 36227.1303997432. The cubic root of 1312404977 is about 1094.8533617916.

The spelling of 1312404977 in words is "one billion, three hundred twelve million, four hundred four thousand, nine hundred seventy-seven".