142973239 has 4 divisors (see below), whose sum is σ = 143036856. Its totient is φ = 142909624.

The previous prime is 142973141. The next prime is 142973297. The reversal of 142973239 is 932379241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 932379241 = 20477 ⋅45533.

It is a cyclic number.

It is not a de Polignac number, because 142973239 - 2⁹ = 142972727 is a prime.

It is a super-2 number, since 2×142973239² = 40882694140302242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142973539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28309 + ... + 32974.

It is an arithmetic number, because the mean of its divisors is an integer number (35759214).

Almost surely, 2^142973239 is an apocalyptic number.

142973239 is a deficient number, since it is larger than the sum of its proper divisors (63617).

142973239 is an equidigital number, since it uses as much as digits as its factorization.

142973239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63616.

The product of its digits is 81648, while the sum is 40.

The square root of 142973239 is about 11957.1417571257. The cubic root of 142973239 is about 522.8995306572.

The spelling of 142973239 in words is "one hundred forty-two million, nine hundred seventy-three thousand, two hundred thirty-nine".