390965 has 4 divisors (see below), whose sum is σ = 469164. Its totient is φ = 312768.

The previous prime is 390961. The next prime is 390967. The reversal of 390965 is 569093.

390965 = 360² + 361² + 362².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 569093 = 7 ⋅81299.

It can be written as a sum of positive squares in 2 ways, for example, as 51076 + 339889 = 226^2 + 583^2 .

It is a cyclic number.

It is not a de Polignac number, because 390965 - 2² = 390961 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 (390961) 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, 39092 + ... + 39101.

It is an arithmetic number, because the mean of its divisors is an integer number (117291).

2³⁹⁰⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

390965 is a deficient number, since it is larger than the sum of its proper divisors (78199).

390965 is an equidigital number, since it uses as much as digits as its factorization.

390965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78198.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 390965 is about 625.2719408385. The cubic root of 390965 is about 73.1216461802.

The spelling of 390965 in words is "three hundred ninety thousand, nine hundred sixty-five".