1315807978 has 8 divisors (see below), whose sum is σ = 1974856068. Its totient is φ = 657522624.

The previous prime is 1315807937. The next prime is 1315807979. The reversal of 1315807978 is 8797085131.

It can be written as a sum of positive squares in 2 ways, for example, as 1123791529 + 192016449 = 33523^2 + 13857^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1315807979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186351 + ... + 193282.

Almost surely, 2^1315807978 is an apocalyptic number.

1315807978 is a deficient number, since it is larger than the sum of its proper divisors (659048090).

1315807978 is a wasteful number, since it uses less digits than its factorization.

1315807978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381368.

The product of its (nonzero) digits is 423360, while the sum is 49.

The square root of 1315807978 is about 36274.0675689948. The cubic root of 1315807978 is about 1095.7988452160.

The spelling of 1315807978 in words is "one billion, three hundred fifteen million, eight hundred seven thousand, nine hundred seventy-eight".