390242 has 4 divisors (see below), whose sum is σ = 585366. Its totient is φ = 195120.

The previous prime is 390223. The next prime is 390263. The reversal of 390242 is 242093.

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., 229441 + 160801 = 479^2 + 401^2 .

It is an unprimeable number.

390242 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 as a sum of consecutive naturals, namely, 97559 + ... + 97562.

2³⁹⁰²⁴² is an apocalyptic number.

390242 is a deficient number, since it is larger than the sum of its proper divisors (195124).

390242 is a wasteful number, since it uses less digits than its factorization.

390242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195123.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 390242 is about 624.6935248584. The cubic root of 390242 is about 73.0765444685.

The spelling of 390242 in words is "three hundred ninety thousand, two hundred forty-two".