390217 has 4 divisors (see below), whose sum is σ = 396676. Its totient is φ = 383760.

The previous prime is 390211. The next prime is 390223. The reversal of 390217 is 712093.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (390211) and next prime (390223).

It can be written as a sum of positive squares in 2 ways, for example, as 7056 + 383161 = 84^2 + 619^2 .

It is a cyclic number.

It is not a de Polignac number, because 390217 - 2³ = 390209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3138 + ... + 3259.

It is an arithmetic number, because the mean of its divisors is an integer number (99169).

2³⁹⁰²¹⁷ is an apocalyptic number.

It is an amenable number.

390217 is a deficient number, since it is larger than the sum of its proper divisors (6459).

390217 is an equidigital number, since it uses as much as digits as its factorization.

390217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6458.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 390217 is about 624.6735147259. The cubic root of 390217 is about 73.0749839389.

The spelling of 390217 in words is "three hundred ninety thousand, two hundred seventeen".