242157507 has 4 divisors (see below), whose sum is σ = 322876680. Its totient is φ = 161438336.

The previous prime is 242157481. The next prime is 242157529. The reversal of 242157507 is 705751242.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 242157507 - 2¹⁵ = 242124739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (242157577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40359582 + ... + 40359587.

It is an arithmetic number, because the mean of its divisors is an integer number (80719170).

Almost surely, 2^242157507 is an apocalyptic number.

242157507 is a deficient number, since it is larger than the sum of its proper divisors (80719173).

242157507 is an equidigital number, since it uses as much as digits as its factorization.

242157507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80719172.

The product of its (nonzero) digits is 19600, while the sum is 33.

The square root of 242157507 is about 15561.4108293561. The cubic root of 242157507 is about 623.3031365229.

The spelling of 242157507 in words is "two hundred forty-two million, one hundred fifty-seven thousand, five hundred seven".