657242 has 4 divisors (see below), whose sum is σ = 985866. Its totient is φ = 328620.

The previous prime is 657233. The next prime is 657257. The reversal of 657242 is 242756.

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., 398161 + 259081 = 631^2 + 509^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164309 + ... + 164312.

2⁶⁵⁷²⁴² is an apocalyptic number.

657242 is a deficient number, since it is larger than the sum of its proper divisors (328624).

657242 is a wasteful number, since it uses less digits than its factorization.

657242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328623.

The product of its digits is 3360, while the sum is 26.

The square root of 657242 is about 810.7046317864. The cubic root of 657242 is about 86.9444309784.

Adding to 657242 its reverse (242756), we get a palindrome (899998).

The spelling of 657242 in words is "six hundred fifty-seven thousand, two hundred forty-two".