491879 has 4 divisors (see below), whose sum is σ = 496584. Its totient is φ = 487176.

The previous prime is 491873. The next prime is 491899. The reversal of 491879 is 978194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491879 - 2¹² = 487783 is a prime.

It is a super-3 number, since 3×491879³ = 357022921129033317, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491873) 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, 2192 + ... + 2405.

It is an arithmetic number, because the mean of its divisors is an integer number (124146).

2⁴⁹¹⁸⁷⁹ is an apocalyptic number.

491879 is a deficient number, since it is larger than the sum of its proper divisors (4705).

491879 is a wasteful number, since it uses less digits than its factorization.

491879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4704.

The product of its digits is 18144, while the sum is 38.

The square root of 491879 is about 701.3408586415. The cubic root of 491879 is about 78.9379954642.

The spelling of 491879 in words is "four hundred ninety-one thousand, eight hundred seventy-nine".