42139830 has 32 divisors (see below), whose sum is σ = 101883744. Its totient is φ = 11154176.

The previous prime is 42139829. The next prime is 42139879. The reversal of 42139830 is 3893124.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1017 + ... + 9236.

It is an arithmetic number, because the mean of its divisors is an integer number (3183867).

Almost surely, 2^42139830 is an apocalyptic number.

42139830 is an abundant number, since it is smaller than the sum of its proper divisors (59743914).

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

42139830 is a wasteful number, since it uses less digits than its factorization.

42139830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10400.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 42139830 is about 6491.5198528542. The cubic root of 42139830 is about 347.9879933762.

The spelling of 42139830 in words is "forty-two million, one hundred thirty-nine thousand, eight hundred thirty".