155242 has 4 divisors (see below), whose sum is σ = 232866. Its totient is φ = 77620.

The previous prime is 155231. The next prime is 155251. The reversal of 155242 is 242551.

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., 123201 + 32041 = 351^2 + 179^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38809 + ... + 38812.

2¹⁵⁵²⁴² is an apocalyptic number.

155242 is a deficient number, since it is larger than the sum of its proper divisors (77624).

155242 is an equidigital number, since it uses as much as digits as its factorization.

155242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77623.

The product of its digits is 400, while the sum is 19.

The square root of 155242 is about 394.0076141396. The cubic root of 155242 is about 53.7447948808.

Adding to 155242 its reverse (242551), we get a palindrome (397793).

The spelling of 155242 in words is "one hundred fifty-five thousand, two hundred forty-two".