390609 has 32 divisors (see below), whose sum is σ = 656640. Its totient is φ = 228096.

The previous prime is 390581. The next prime is 390647. The reversal of 390609 is 906093.

It is not a de Polignac number, because 390609 - 2⁸ = 390353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10539 + ... + 10575.

It is an arithmetic number, because the mean of its divisors is an integer number (20520).

2³⁹⁰⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

390609 is a deficient number, since it is larger than the sum of its proper divisors (266031).

390609 is a wasteful number, since it uses less digits than its factorization.

390609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 390609 is about 624.9871998689. The cubic root of 390609 is about 73.0994453770.

It can be divided in two parts, 390 and 609, that added together give a palindrome (999).

The spelling of 390609 in words is "three hundred ninety thousand, six hundred nine".