157442 has 4 divisors (see below), whose sum is σ = 236166. Its totient is φ = 78720.

The previous prime is 157433. The next prime is 157457. The reversal of 157442 is 244751.

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

It can be written as a sum of positive squares in only one way, i.e., 128881 + 28561 = 359^2 + 169^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39359 + ... + 39362.

2¹⁵⁷⁴⁴² is an apocalyptic number.

157442 is a deficient number, since it is larger than the sum of its proper divisors (78724).

157442 is an equidigital number, since it uses as much as digits as its factorization.

157442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78723.

The product of its digits is 1120, while the sum is 23.

The square root of 157442 is about 396.7896167996. The cubic root of 157442 is about 53.9974850223.

The spelling of 157442 in words is "one hundred fifty-seven thousand, four hundred forty-two".