279090389 has 4 divisors (see below), whose sum is σ = 279197856. Its totient is φ = 278982924.

The previous prime is 279090359. The next prime is 279090397. The reversal of 279090389 is 983090972.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 279090389 - 2¹² = 279086293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (279090319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49739 + ... + 55064.

It is an arithmetic number, because the mean of its divisors is an integer number (69799464).

Almost surely, 2^279090389 is an apocalyptic number.

It is an amenable number.

279090389 is a deficient number, since it is larger than the sum of its proper divisors (107467).

279090389 is a wasteful number, since it uses less digits than its factorization.

279090389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107466.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 279090389 is about 16705.9985933197. The cubic root of 279090389 is about 653.5040654437.

Adding to 279090389 its sum of digits (47), we get a square (279090436 = 16706²).

The spelling of 279090389 in words is "two hundred seventy-nine million, ninety thousand, three hundred eighty-nine".