142928639 has 12 divisors (see below), whose sum is σ = 176045184. Its totient is φ = 115303104.

The previous prime is 142928593. The next prime is 142928663. The reversal of 142928639 is 936829241.

It is not a de Polignac number, because 142928639 - 2¹² = 142924543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 142928639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142928699) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84959 + ... + 86624.

It is an arithmetic number, because the mean of its divisors is an integer number (14670432).

Almost surely, 2^142928639 is an apocalyptic number.

142928639 is a deficient number, since it is larger than the sum of its proper divisors (33116545).

142928639 is a wasteful number, since it uses less digits than its factorization.

142928639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171614 (or 171607 counting only the distinct ones).

The product of its digits is 186624, while the sum is 44.

The square root of 142928639 is about 11955.2766174606. The cubic root of 142928639 is about 522.8451527781.

The spelling of 142928639 in words is "one hundred forty-two million, nine hundred twenty-eight thousand, six hundred thirty-nine".