281979 has 24 divisors (see below), whose sum is σ = 458640. Its totient is φ = 165888.

The previous prime is 281971. The next prime is 281989. The reversal of 281979 is 979182.

281979 = T₇₄ + T₇₅ + ... + T₁₂₇.

It is a happy number.

It is not a de Polignac number, because 281979 - 2³ = 281971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (281971) 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 23 ways as a sum of consecutive naturals, for example, 2859 + ... + 2955.

It is an arithmetic number, because the mean of its divisors is an integer number (19110).

2²⁸¹⁹⁷⁹ is an apocalyptic number.

281979 is a deficient number, since it is larger than the sum of its proper divisors (176661).

281979 is a wasteful number, since it uses less digits than its factorization.

281979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 136 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 281979 is about 531.0169488820. The cubic root of 281979 is about 65.5750940303.

The spelling of 281979 in words is "two hundred eighty-one thousand, nine hundred seventy-nine".