390943 has 4 divisors (see below), whose sum is σ = 446800. Its totient is φ = 335088.

The previous prime is 390893. The next prime is 390953. The reversal of 390943 is 349093.

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

It is a cyclic number.

It is not a de Polignac number, because 390943 - 2¹³ = 382751 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 (390953) 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, 27918 + ... + 27931.

It is an arithmetic number, because the mean of its divisors is an integer number (111700).

2³⁹⁰⁹⁴³ is an apocalyptic number.

390943 is a deficient number, since it is larger than the sum of its proper divisors (55857).

390943 is an equidigital number, since it uses as much as digits as its factorization.

390943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55856.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 390943 is about 625.2543482456. The cubic root of 390943 is about 73.1202746112.

The spelling of 390943 in words is "three hundred ninety thousand, nine hundred forty-three".