390806 has 8 divisors (see below), whose sum is σ = 631344. Its totient is φ = 180360.

The previous prime is 390791. The next prime is 390809. The reversal of 390806 is 608093.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 15031 = 390806 / (3 + 9 + 0 + 8 + 0 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390809) 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, 7490 + ... + 7541.

It is an arithmetic number, because the mean of its divisors is an integer number (78918).

2³⁹⁰⁸⁰⁶ is an apocalyptic number.

390806 is a deficient number, since it is larger than the sum of its proper divisors (240538).

390806 is a wasteful number, since it uses less digits than its factorization.

390806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15046.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 390806 is about 625.1447832303. The cubic root of 390806 is about 73.1117323191. Note that the first 3 decimals are identical.

Adding to 390806 its reverse (608093), we get a palindrome (998899).

It can be divided in two parts, 3 and 90806, that added together give a palindrome (90809).

The spelling of 390806 in words is "three hundred ninety thousand, eight hundred six".