42979613 has 4 divisors (see below), whose sum is σ = 43462620. Its totient is φ = 42496608.

The previous prime is 42979589. The next prime is 42979619. The reversal of 42979613 is 31697924.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24334489 + 18645124 = 4933^2 + 4318^2 .

It is a cyclic number.

It is not a de Polignac number, because 42979613 - 2¹⁴ = 42963229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42979619) 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, 241370 + ... + 241547.

It is an arithmetic number, because the mean of its divisors is an integer number (10865655).

Almost surely, 2^42979613 is an apocalyptic number.

It is an amenable number.

42979613 is a deficient number, since it is larger than the sum of its proper divisors (483007).

42979613 is an equidigital number, since it uses as much as digits as its factorization.

42979613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483006.

The product of its digits is 81648, while the sum is 41.

The square root of 42979613 is about 6555.8838458289. The cubic root of 42979613 is about 350.2844300178.

The spelling of 42979613 in words is "forty-two million, nine hundred seventy-nine thousand, six hundred thirteen".