617879 has 2 divisors, whose sum is σ = 617880. Its totient is φ = 617878.

The previous prime is 617873. The next prime is 617887. The reversal of 617879 is 978716.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-617879 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (617873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308939 + 308940.

It is an arithmetic number, because the mean of its divisors is an integer number (308940).

2⁶¹⁷⁸⁷⁹ is an apocalyptic number.

617879 is a deficient number, since it is larger than the sum of its proper divisors (1).

617879 is an equidigital number, since it uses as much as digits as its factorization.

617879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 38.

The square root of 617879 is about 786.0527972089. The cubic root of 617879 is about 85.1728432188.

The spelling of 617879 in words is "six hundred seventeen thousand, eight hundred seventy-nine".