391925 has 12 divisors (see below), whose sum is σ = 495876. Its totient is φ = 307200.

The previous prime is 391921. The next prime is 391939. The reversal of 391925 is 529193.

391925 = 113² + 114² + ... + 137².

391925 is nontrivially palindromic in base 4 and base 16.

It can be written as a sum of positive squares in 6 ways, for example, as 5041 + 386884 = 71^2 + 622^2 .

It is not a de Polignac number, because 391925 - 2² = 391921 is a prime.

It is a Duffinian number.

It is a plaindrome in base 6.

It is a zygodrome in base 4.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391925.

It is not an unprimeable number, because it can be changed into a prime (391921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1397 + ... + 1653.

It is an arithmetic number, because the mean of its divisors is an integer number (41323).

2³⁹¹⁹²⁵ is an apocalyptic number.

It is an amenable number.

391925 is a deficient number, since it is larger than the sum of its proper divisors (103951).

391925 is a wasteful number, since it uses less digits than its factorization.

391925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328 (or 323 counting only the distinct ones).

The product of its digits is 2430, while the sum is 29.

The square root of 391925 is about 626.0391361568. The cubic root of 391925 is about 73.1814464210.

It can be divided in two parts, 391 and 925, that multiplied together give a triangular number (361675 = T₈₅₀).

The spelling of 391925 in words is "three hundred ninety-one thousand, nine hundred twenty-five".