1299780878 has 16 divisors (see below), whose sum is σ = 2129898240. Its totient is φ = 589980600.

The previous prime is 1299780877. The next prime is 1299780907. The reversal of 1299780878 is 8780879921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299780877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25268 + ... + 56903.

It is an arithmetic number, because the mean of its divisors is an integer number (133118640).

Almost surely, 2^1299780878 is an apocalyptic number.

1299780878 is a deficient number, since it is larger than the sum of its proper divisors (830117362).

1299780878 is a wasteful number, since it uses less digits than its factorization.

1299780878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82903.

The product of its (nonzero) digits is 4064256, while the sum is 59.

The square root of 1299780878 is about 36052.4739511729. The cubic root of 1299780878 is about 1091.3315595665.

The spelling of 1299780878 in words is "one billion, two hundred ninety-nine million, seven hundred eighty thousand, eight hundred seventy-eight".