142138836 has 72 divisors (see below), whose sum is σ = 434790720. Its totient is φ = 38221056.

The previous prime is 142138823. The next prime is 142138859. The reversal of 142138836 is 638831241.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 142138836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12306 + ... + 20873.

It is an arithmetic number, because the mean of its divisors is an integer number (6038760).

Almost surely, 2^142138836 is an apocalyptic number.

It is an amenable number.

142138836 is an abundant number, since it is smaller than the sum of its proper divisors (292651884).

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

142138836 is a wasteful number, since it uses less digits than its factorization.

142138836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33213 (or 33208 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 142138836 is about 11922.1992937545. The cubic root of 142138836 is about 521.8803178298.

The spelling of 142138836 in words is "one hundred forty-two million, one hundred thirty-eight thousand, eight hundred thirty-six".