279980749 has 2 divisors, whose sum is σ = 279980750. Its totient is φ = 279980748.

The previous prime is 279980707. The next prime is 279980773. The reversal of 279980749 is 947089972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265918249 + 14062500 = 16307^2 + 3750^2 .

It is a cyclic number.

It is not a de Polignac number, because 279980749 - 2⁷ = 279980621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 279980749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (279980149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139990374 + 139990375.

It is an arithmetic number, because the mean of its divisors is an integer number (139990375).

Almost surely, 2^279980749 is an apocalyptic number.

It is an amenable number.

279980749 is a deficient number, since it is larger than the sum of its proper divisors (1).

279980749 is an equidigital number, since it uses as much as digits as its factorization.

279980749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The square root of 279980749 is about 16732.6252871449. The cubic root of 279980749 is about 654.1982685280.

The spelling of 279980749 in words is "two hundred seventy-nine million, nine hundred eighty thousand, seven hundred forty-nine".