42979517 has 6 divisors (see below), whose sum is σ = 49996638. Its totient is φ = 36839544.

The previous prime is 42979507. The next prime is 42979523. The reversal of 42979517 is 71597924.

It can be written as a sum of positive squares in only one way, i.e., 31595641 + 11383876 = 5621^2 + 3374^2 .

It is not a de Polignac number, because 42979517 - 2¹⁴ = 42963133 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 (42979507) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 438518 + ... + 438615.

It is an arithmetic number, because the mean of its divisors is an integer number (8332773).

Almost surely, 2^42979517 is an apocalyptic number.

It is an amenable number.

42979517 is a deficient number, since it is larger than the sum of its proper divisors (7017121).

42979517 is an equidigital number, since it uses as much as digits as its factorization.

42979517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877147 (or 877140 counting only the distinct ones).

The product of its digits is 158760, while the sum is 44.

The square root of 42979517 is about 6555.8765241575. The cubic root of 42979517 is about 350.2841692171.

The spelling of 42979517 in words is "forty-two million, nine hundred seventy-nine thousand, five hundred seventeen".