1379999249 has 16 divisors (see below), whose sum is σ = 1469437200. Its totient is φ = 1293513984.

The previous prime is 1379999237. The next prime is 1379999267. The reversal of 1379999249 is 9429999731.

It can be written as a sum of positive squares in 8 ways, for example, as 44462224 + 1335537025 = 6668^2 + 36545^2 .

It is a cyclic number.

It is not a de Polignac number, because 1379999249 - 2²⁴ = 1363222033 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1379999191 and 1379999200.

It is not an unprimeable number, because it can be changed into a prime (1379999209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 596507 + ... + 598815.

It is an arithmetic number, because the mean of its divisors is an integer number (91839825).

Almost surely, 2^1379999249 is an apocalyptic number.

It is an amenable number.

1379999249 is a deficient number, since it is larger than the sum of its proper divisors (89437951).

1379999249 is a wasteful number, since it uses less digits than its factorization.

1379999249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2932.

The product of its digits is 9920232, while the sum is 62.

The square root of 1379999249 is about 37148.3411338918. The cubic root of 1379999249 is about 1113.3360795606.

The spelling of 1379999249 in words is "one billion, three hundred seventy-nine million, nine hundred ninety-nine thousand, two hundred forty-nine".