390834 has 12 divisors (see below), whose sum is σ = 846846. Its totient is φ = 130272.

The previous prime is 390829. The next prime is 390851. The reversal of 390834 is 438093.

It can be written as a sum of positive squares in only one way, i.e., 363609 + 27225 = 603^2 + 165^2 .

It is a nialpdrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 390798 and 390807.

It is a congruent number.

It is an unprimeable number.

390834 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 in 5 ways as a sum of consecutive naturals, for example, 10839 + ... + 10874.

2³⁹⁰⁸³⁴ is an apocalyptic number.

390834 is an abundant number, since it is smaller than the sum of its proper divisors (456012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

390834 is a wasteful number, since it uses less digits than its factorization.

390834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21721 (or 21718 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 390834 is about 625.1671776413. The cubic root of 390834 is about 73.1134783513.

The spelling of 390834 in words is "three hundred ninety thousand, eight hundred thirty-four".