42979812 has 12 divisors (see below), whose sum is σ = 100286256. Its totient is φ = 14326600.

The previous prime is 42979771. The next prime is 42979817. The reversal of 42979812 is 21897924.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (42979817) 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, 1790814 + ... + 1790837.

It is an arithmetic number, because the mean of its divisors is an integer number (8357188).

Almost surely, 2^42979812 is an apocalyptic number.

It is an amenable number.

42979812 is an abundant number, since it is smaller than the sum of its proper divisors (57306444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42979812 is a wasteful number, since it uses less digits than its factorization.

42979812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3581658 (or 3581656 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 42979812 is about 6555.8990230174. The cubic root of 42979812 is about 350.2849706345.

The spelling of 42979812 in words is "forty-two million, nine hundred seventy-nine thousand, eight hundred twelve".