42979 has 2 divisors, whose sum is σ = 42980. Its totient is φ = 42978.

The previous prime is 42967. The next prime is 42989. The reversal of 42979 is 97924.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42979 - 2⁹ = 42467 is a prime.

It is a Chen prime.

42979 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 42979.

It is not a weakly prime, because it can be changed into another prime (42929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21489 + 21490.

It is an arithmetic number, because the mean of its divisors is an integer number (21490).

2⁴²⁹⁷⁹ is an apocalyptic number.

42979 is a deficient number, since it is larger than the sum of its proper divisors (1).

42979 is an equidigital number, since it uses as much as digits as its factorization.

42979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 42979 is about 207.3137718532. The cubic root of 42979 is about 35.0282764690.

Subtracting 42979 from its reverse (97924), we obtain a palindrome (54945).

The spelling of 42979 in words is "forty-two thousand, nine hundred seventy-nine".