390709 has 6 divisors (see below), whose sum is σ = 429590. Its totient is φ = 355080.

The previous prime is 390707. The next prime is 390721. The reversal of 390709 is 907093.

It can be written as a sum of positive squares in only one way, i.e., 302500 + 88209 = 550^2 + 297^2 .

It is not a de Polignac number, because 390709 - 2¹ = 390707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390703) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1494 + ... + 1735.

2³⁹⁰⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

390709 is a deficient number, since it is larger than the sum of its proper divisors (38881).

390709 is a wasteful number, since it uses less digits than its factorization.

390709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3251 (or 3240 counting only the distinct ones).

The product of its (nonzero) digits is 1701, while the sum is 28.

The square root of 390709 is about 625.0671963877. The cubic root of 390709 is about 73.1056829196.

The spelling of 390709 in words is "three hundred ninety thousand, seven hundred nine".