1299916378 has 8 divisors (see below), whose sum is σ = 1971783540. Its totient is φ = 642655200.

The previous prime is 1299916363. The next prime is 1299916391. The reversal of 1299916378 is 8736199921.

It can be written as a sum of positive squares in 2 ways, for example, as 1146973689 + 152942689 = 33867^2 + 12367^2 .

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

It is an unprimeable number.

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, 3651273 + ... + 3651628.

Almost surely, 2^1299916378 is an apocalyptic number.

1299916378 is a deficient number, since it is larger than the sum of its proper divisors (671867162).

1299916378 is an equidigital number, since it uses as much as digits as its factorization.

1299916378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7302992.

The product of its digits is 1469664, while the sum is 55.

The square root of 1299916378 is about 36054.3531074959. The cubic root of 1299916378 is about 1091.3694814169.

The spelling of 1299916378 in words is "one billion, two hundred ninety-nine million, nine hundred sixteen thousand, three hundred seventy-eight".