242138 has 16 divisors (see below), whose sum is σ = 399840. Its totient is φ = 109296.

The previous prime is 242129. The next prime is 242147. The reversal of 242138 is 831242.

It is an interprime number because it is at equal distance from previous prime (242129) and next prime (242147).

It is a super-2 number, since 2×242138² = 117261622088, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 242138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1673 + ... + 1811.

It is an arithmetic number, because the mean of its divisors is an integer number (24990).

2²⁴²¹³⁸ is an apocalyptic number.

242138 is a deficient number, since it is larger than the sum of its proper divisors (157702).

242138 is a wasteful number, since it uses less digits than its factorization.

242138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221.

The product of its digits is 384, while the sum is 20.

The square root of 242138 is about 492.0751975054. The cubic root of 242138 is about 62.3286399344.

The spelling of 242138 in words is "two hundred forty-two thousand, one hundred thirty-eight".