391825 has 12 divisors (see below), whose sum is σ = 555520. Its totient is φ = 268560.

The previous prime is 391823. The next prime is 391847. The reversal of 391825 is 528193.

It is not a de Polignac number, because 391825 - 2¹ = 391823 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 391793 and 391802.

It is not an unprimeable number, because it can be changed into a prime (391823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 945 + ... + 1294.

2³⁹¹⁸²⁵ is an apocalyptic number.

391825 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

391825 is a deficient number, since it is larger than the sum of its proper divisors (163695).

391825 is a wasteful number, since it uses less digits than its factorization.

391825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256 (or 2251 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 391825 is about 625.9592638503. The cubic root of 391825 is about 73.1752217886.

The spelling of 391825 in words is "three hundred ninety-one thousand, eight hundred twenty-five".