142139999 has 4 divisors (see below), whose sum is σ = 142333080. Its totient is φ = 141946920.

The previous prime is 142139981. The next prime is 142140029. The reversal of 142139999 is 999931241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999931241 = 30949 ⋅32309.

It is a cyclic number.

It is not a de Polignac number, because 142139999 - 2¹⁶ = 142074463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142132999) 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, 95432 + ... + 96909.

It is an arithmetic number, because the mean of its divisors is an integer number (35583270).

Almost surely, 2^142139999 is an apocalyptic number.

142139999 is a deficient number, since it is larger than the sum of its proper divisors (193081).

142139999 is an equidigital number, since it uses as much as digits as its factorization.

142139999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193080.

The product of its digits is 157464, while the sum is 47.

The square root of 142139999 is about 11922.2480682126. The cubic root of 142139999 is about 521.8817411920.

The spelling of 142139999 in words is "one hundred forty-two million, one hundred thirty-nine thousand, nine hundred ninety-nine".