9142239 has 4 divisors (see below), whose sum is σ = 12189656. Its totient is φ = 6094824.

The previous prime is 9142229. The next prime is 9142283. The reversal of 9142239 is 9322419.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9322419 = 3 ⋅3107473.

It is not a de Polignac number, because 9142239 - 2⁵ = 9142207 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 (9142229) 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, 1523704 + ... + 1523709.

It is an arithmetic number, because the mean of its divisors is an integer number (3047414).

Almost surely, 2^9142239 is an apocalyptic number.

9142239 is a deficient number, since it is larger than the sum of its proper divisors (3047417).

9142239 is a wasteful number, since it uses less digits than its factorization.

9142239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047416.

The product of its digits is 3888, while the sum is 30.

The square root of 9142239 is about 3023.6135665789. The cubic root of 9142239 is about 209.0984708785.

The spelling of 9142239 in words is "nine million, one hundred forty-two thousand, two hundred thirty-nine".