242689538 has 64 divisors (see below), whose sum is σ = 462309120. Its totient is φ = 93007872.

The previous prime is 242689519. The next prime is 242689543. The reversal of 242689538 is 835986242.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 242689492 and 242689501.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1041470 + ... + 1041702.

It is an arithmetic number, because the mean of its divisors is an integer number (7223580).

Almost surely, 2^242689538 is an apocalyptic number.

242689538 is a deficient number, since it is larger than the sum of its proper divisors (219619582).

242689538 is a wasteful number, since it uses less digits than its factorization.

242689538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411.

The product of its digits is 829440, while the sum is 47.

The square root of 242689538 is about 15578.4960121316. The cubic root of 242689538 is about 623.7592776962.

The spelling of 242689538 in words is "two hundred forty-two million, six hundred eighty-nine thousand, five hundred thirty-eight".