390842 has 8 divisors (see below), whose sum is σ = 594516. Its totient is φ = 192672.

The previous prime is 390829. The next prime is 390851. The reversal of 390842 is 248093.

It can be written as a sum of positive squares in 2 ways, for example, as 358801 + 32041 = 599^2 + 179^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1193 + ... + 1484.

2³⁹⁰⁸⁴² is an apocalyptic number.

390842 is a deficient number, since it is larger than the sum of its proper divisors (203674).

390842 is a wasteful number, since it uses less digits than its factorization.

390842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2752.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 390842 is about 625.1735758971. The cubic root of 390842 is about 73.1139772023.

The spelling of 390842 in words is "three hundred ninety thousand, eight hundred forty-two".