242812557 has 24 divisors (see below), whose sum is σ = 384844824. Its totient is φ = 146600064.

The previous prime is 242812523. The next prime is 242812613. The reversal of 242812557 is 755218242.

It is a happy number.

242812557 is a `hidden beast` number, since 24 + 2 + 81 + 2 + 557 = 666.

242812557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 57062916 + 185749641 = 7554^2 + 13629^2 .

It is not a de Polignac number, because 242812557 - 2¹¹ = 242810509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242812957) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13378 + ... + 25779.

It is an arithmetic number, because the mean of its divisors is an integer number (16035201).

Almost surely, 2^242812557 is an apocalyptic number.

It is an amenable number.

242812557 is a deficient number, since it is larger than the sum of its proper divisors (142032267).

242812557 is a wasteful number, since it uses less digits than its factorization.

242812557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39229 (or 39226 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 242812557 is about 15582.4438712289. The cubic root of 242812557 is about 623.8646541391.

The spelling of 242812557 in words is "two hundred forty-two million, eight hundred twelve thousand, five hundred fifty-seven".