242749857 has 16 divisors (see below), whose sum is σ = 374589440. Its totient is φ = 136957392.

The previous prime is 242749853. The next prime is 242749873. The reversal of 242749857 is 758947242.

It is not a de Polignac number, because 242749857 - 2² = 242749853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242749853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71503 + ... + 74820.

It is an arithmetic number, because the mean of its divisors is an integer number (23411840).

Almost surely, 2^242749857 is an apocalyptic number.

It is an amenable number.

242749857 is a deficient number, since it is larger than the sum of its proper divisors (131839583).

242749857 is a wasteful number, since it uses less digits than its factorization.

242749857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146412.

The product of its digits is 1128960, while the sum is 48.

The square root of 242749857 is about 15580.4318617938. The cubic root of 242749857 is about 623.8109505997.

The spelling of 242749857 in words is "two hundred forty-two million, seven hundred forty-nine thousand, eight hundred fifty-seven".