42879906 has 12 divisors (see below), whose sum is σ = 92906502. Its totient is φ = 14293296.

The previous prime is 42879871. The next prime is 42879911. The reversal of 42879906 is 60997824.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 41796225 + 1083681 = 6465^2 + 1041^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1191091 + ... + 1191126.

Almost surely, 2^42879906 is an apocalyptic number.

42879906 is an abundant number, since it is smaller than the sum of its proper divisors (50026596).

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

42879906 is a wasteful number, since it uses less digits than its factorization.

42879906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382225 (or 2382222 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 42879906 is about 6548.2750400392. The cubic root of 42879906 is about 350.0133491507.

The spelling of 42879906 in words is "forty-two million, eight hundred seventy-nine thousand, nine hundred six".