242647557 has 8 divisors (see below), whose sum is σ = 323705184. Its totient is φ = 161677488.

The previous prime is 242647519. The next prime is 242647577. The reversal of 242647557 is 755746242.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 242647557 - 2¹⁰ = 242646533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242647577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15123 + ... + 26720.

It is an arithmetic number, because the mean of its divisors is an integer number (40463148).

Almost surely, 2^242647557 is an apocalyptic number.

It is an amenable number.

242647557 is a deficient number, since it is larger than the sum of its proper divisors (81057627).

242647557 is a wasteful number, since it uses less digits than its factorization.

242647557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43779.

The product of its digits is 470400, while the sum is 42.

The square root of 242647557 is about 15577.1485516445. The cubic root of 242647557 is about 623.7233091793.

The spelling of 242647557 in words is "two hundred forty-two million, six hundred forty-seven thousand, five hundred fifty-seven".