242138439 has 6 divisors (see below), whose sum is σ = 349755536. Its totient is φ = 161425620.

The previous prime is 242138401. The next prime is 242138441. The reversal of 242138439 is 934831242.

242138439 is a `hidden beast` number, since 2 + 4 + 213 + 8 + 439 = 666.

It is not a de Polignac number, because 242138439 - 2⁷ = 242138311 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 (242138459) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13452127 + ... + 13452144.

Almost surely, 2^242138439 is an apocalyptic number.

242138439 is a deficient number, since it is larger than the sum of its proper divisors (107617097).

242138439 is a wasteful number, since it uses less digits than its factorization.

242138439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26904277 (or 26904274 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 242138439 is about 15560.7981479100. The cubic root of 242138439 is about 623.2867760194.

The spelling of 242138439 in words is "two hundred forty-two million, one hundred thirty-eight thousand, four hundred thirty-nine".