242572139 has 4 divisors (see below), whose sum is σ = 245988720. Its totient is φ = 239155560.

The previous prime is 242572129. The next prime is 242572163. The reversal of 242572139 is 931275242.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931275242 = 2 ⋅465637621.

It is a cyclic number.

It is not a de Polignac number, because 242572139 - 2⁸ = 242571883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 242572099 and 242572108.

It is not an unprimeable number, because it can be changed into a prime (242572129) 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, 1708184 + ... + 1708325.

It is an arithmetic number, because the mean of its divisors is an integer number (61497180).

Almost surely, 2^242572139 is an apocalyptic number.

242572139 is a deficient number, since it is larger than the sum of its proper divisors (3416581).

242572139 is an equidigital number, since it uses as much as digits as its factorization.

242572139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3416580.

The product of its digits is 30240, while the sum is 35.

The square root of 242572139 is about 15574.7275738614. The cubic root of 242572139 is about 623.6586820585.

The spelling of 242572139 in words is "two hundred forty-two million, five hundred seventy-two thousand, one hundred thirty-nine".