391266 has 12 divisors (see below), whose sum is σ = 847782. Its totient is φ = 130416.

The previous prime is 391249. The next prime is 391273. The reversal of 391266 is 662193.

It is a happy number.

391266 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 385641 + 5625 = 621^2 + 75^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

391266 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10851 + ... + 10886.

2³⁹¹²⁶⁶ is an apocalyptic number.

391266 is an abundant number, since it is smaller than the sum of its proper divisors (456516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391266 is a wasteful number, since it uses less digits than its factorization.

391266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21745 (or 21742 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 391266 is about 625.5125898014. The cubic root of 391266 is about 73.1404065719.

The spelling of 391266 in words is "three hundred ninety-one thousand, two hundred sixty-six".