157242 has 16 divisors (see below), whose sum is σ = 319680. Its totient is φ = 51552.

The previous prime is 157231. The next prime is 157243. The reversal of 157242 is 242751.

157242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (157243) by changing a digit.

157242 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259 + ... + 617.

It is an arithmetic number, because the mean of its divisors is an integer number (19980).

2¹⁵⁷²⁴² is an apocalyptic number.

157242 is an abundant number, since it is smaller than the sum of its proper divisors (162438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

157242 is a wasteful number, since it uses less digits than its factorization.

157242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437.

The product of its digits is 560, while the sum is 21.

The square root of 157242 is about 396.5375139883. The cubic root of 157242 is about 53.9746108356.

Adding to 157242 its reverse (242751), we get a palindrome (399993).

The spelling of 157242 in words is "one hundred fifty-seven thousand, two hundred forty-two".