42108439 has 4 divisors (see below), whose sum is σ = 44585424. Its totient is φ = 39631456.

The previous prime is 42108431. The next prime is 42108449. The reversal of 42108439 is 93480124.

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 42108439 - 2³ = 42108431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42108439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42108431) 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, 1238467 + ... + 1238500.

It is an arithmetic number, because the mean of its divisors is an integer number (11146356).

Almost surely, 2^42108439 is an apocalyptic number.

42108439 is a deficient number, since it is larger than the sum of its proper divisors (2476985).

42108439 is a wasteful number, since it uses less digits than its factorization.

42108439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2476984.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 42108439 is about 6489.1015556855. The cubic root of 42108439 is about 347.9015636282.

The spelling of 42108439 in words is "forty-two million, one hundred eight thousand, four hundred thirty-nine".