390431 has 4 divisors (see below), whose sum is σ = 411000. Its totient is φ = 369864.

The previous prime is 390421. The next prime is 390433. The reversal of 390431 is 134093.

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 390431 - 2⁶ = 390367 is a prime.

It is a super-2 number, since 2×390431² = 304872731522, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390433) 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, 10256 + ... + 10293.

It is an arithmetic number, because the mean of its divisors is an integer number (102750).

2³⁹⁰⁴³¹ is an apocalyptic number.

390431 is a deficient number, since it is larger than the sum of its proper divisors (20569).

390431 is a wasteful number, since it uses less digits than its factorization.

390431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20568.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 390431 is about 624.8447807256. The cubic root of 390431 is about 73.0883399167.

The spelling of 390431 in words is "three hundred ninety thousand, four hundred thirty-one".