42979679 has 2 divisors, whose sum is σ = 42979680. Its totient is φ = 42979678.

The previous prime is 42979669. The next prime is 42979697. The reversal of 42979679 is 97697924.

It is a happy number.

Together with next prime (42979697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42979679 - 2²⁰ = 41931103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42979679.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42979619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21489839 + 21489840.

It is an arithmetic number, because the mean of its divisors is an integer number (21489840).

Almost surely, 2^42979679 is an apocalyptic number.

42979679 is a deficient number, since it is larger than the sum of its proper divisors (1).

42979679 is an equidigital number, since it uses as much as digits as its factorization.

42979679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 53.

The square root of 42979679 is about 6555.8888794732. Note that the first 4 decimals coincide. The cubic root of 42979679 is about 350.2846093180.

It can be divided in two parts, 429 and 79679, that added together give a palindrome (80108).

The spelling of 42979679 in words is "forty-two million, nine hundred seventy-nine thousand, six hundred seventy-nine".