142239728 has 20 divisors (see below), whose sum is σ = 287572368. Its totient is φ = 68027520.

The previous prime is 142239707. The next prime is 142239761. The reversal of 142239728 is 827932241.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 142239691 and 142239700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192893 + ... + 193628.

Almost surely, 2^142239728 is an apocalyptic number.

It is an amenable number.

142239728 is an abundant number, since it is smaller than the sum of its proper divisors (145332640).

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

142239728 is a wasteful number, since it uses less digits than its factorization.

142239728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386552 (or 386546 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 142239728 is about 11926.4298094610. The cubic root of 142239728 is about 522.0037677781.

The spelling of 142239728 in words is "one hundred forty-two million, two hundred thirty-nine thousand, seven hundred twenty-eight".