391268 has 12 divisors (see below), whose sum is σ = 708540. Its totient is φ = 188832.

The previous prime is 391249. The next prime is 391273. The reversal of 391268 is 862193.

391268 = T₁₇ + T₁₈ + ... + T₁₃₂.

It can be written as a sum of positive squares in 2 ways, for example, as 322624 + 68644 = 568^2 + 262^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 391268.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1571 + ... + 1802.

It is an arithmetic number, because the mean of its divisors is an integer number (59045).

2³⁹¹²⁶⁸ is an apocalyptic number.

It is an amenable number.

391268 is a deficient number, since it is larger than the sum of its proper divisors (317272).

391268 is a wasteful number, since it uses less digits than its factorization.

391268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3406 (or 3404 counting only the distinct ones).

The product of its digits is 2592, while the sum is 29.

The square root of 391268 is about 625.5141884882. The cubic root of 391268 is about 73.1405311935.

The spelling of 391268 in words is "three hundred ninety-one thousand, two hundred sixty-eight".