279440991 has 12 divisors (see below), whose sum is σ = 412225632. Its totient is φ = 182330016.

The previous prime is 279440989. The next prime is 279441023. The reversal of 279440991 is 199044972.

It is a happy number.

It is not a de Polignac number, because 279440991 - 2¹ = 279440989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (279440911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 329886 + ... + 330731.

It is an arithmetic number, because the mean of its divisors is an integer number (34352136).

Almost surely, 2^279440991 is an apocalyptic number.

279440991 is a deficient number, since it is larger than the sum of its proper divisors (132784641).

279440991 is a wasteful number, since it uses less digits than its factorization.

279440991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660670 (or 660667 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 279440991 is about 16716.4885965923. The cubic root of 279440991 is about 653.7776016239. Note that the first 3 decimals are identical.

The spelling of 279440991 in words is "two hundred seventy-nine million, four hundred forty thousand, nine hundred ninety-one".