390890 has 8 divisors (see below), whose sum is σ = 703620. Its totient is φ = 156352.

The previous prime is 390889. The next prime is 390893. The reversal of 390890 is 98093.

It can be written as a sum of positive squares in 2 ways, for example, as 380689 + 10201 = 617^2 + 101^2 .

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

It is not an unprimeable number, because it can be changed into a prime (390893) by changing a digit.

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, 19535 + ... + 19554.

2³⁹⁰⁸⁹⁰ is an apocalyptic number.

390890 is a deficient number, since it is larger than the sum of its proper divisors (312730).

390890 is a wasteful number, since it uses less digits than its factorization.

390890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39096.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 390890 is about 625.2119640570. The cubic root of 390890 is about 73.1169701656.

The spelling of 390890 in words is "three hundred ninety thousand, eight hundred ninety".