242188857 has 12 divisors (see below), whose sum is σ = 357964464. Its totient is φ = 157704120.

The previous prime is 242188841. The next prime is 242188867. The reversal of 242188857 is 758881242.

It is a happy number.

It is not a de Polignac number, because 242188857 - 2⁴ = 242188841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (242188867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 312519 + ... + 313292.

It is an arithmetic number, because the mean of its divisors is an integer number (29830372).

Almost surely, 2^242188857 is an apocalyptic number.

It is an amenable number.

242188857 is a deficient number, since it is larger than the sum of its proper divisors (115775607).

242188857 is a wasteful number, since it uses less digits than its factorization.

242188857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625860 (or 625857 counting only the distinct ones).

The product of its digits is 286720, while the sum is 45.

The square root of 242188857 is about 15562.4180961700. The cubic root of 242188857 is about 623.3300332183.

The spelling of 242188857 in words is "two hundred forty-two million, one hundred eighty-eight thousand, eight hundred fifty-seven".