42687979 has 4 divisors (see below), whose sum is σ = 43202376. Its totient is φ = 42173584.

The previous prime is 42687917. The next prime is 42687989. The reversal of 42687979 is 97978624.

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

It is a cyclic number.

It is not a de Polignac number, because 42687979 - 2⁹ = 42687467 is a prime.

It is a super-3 number, since 3×42687979³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42687989) 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, 257074 + ... + 257239.

It is an arithmetic number, because the mean of its divisors is an integer number (10800594).

Almost surely, 2^42687979 is an apocalyptic number.

42687979 is a deficient number, since it is larger than the sum of its proper divisors (514397).

42687979 is an equidigital number, since it uses as much as digits as its factorization.

42687979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514396.

The product of its digits is 1524096, while the sum is 52.

The square root of 42687979 is about 6533.6038294344. The cubic root of 42687979 is about 349.4903575788.

The spelling of 42687979 in words is "forty-two million, six hundred eighty-seven thousand, nine hundred seventy-nine".