391285125 has 96 divisors (see below), whose sum is σ = 879600384. Its totient is φ = 162576000.

The previous prime is 391285123. The next prime is 391285151. The reversal of 391285125 is 521582193.

It is not a de Polignac number, because 391285125 - 2¹ = 391285123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 391285125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391285123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 84367 + ... + 88883.

It is an arithmetic number, because the mean of its divisors is an integer number (9162504).

Almost surely, 2^391285125 is an apocalyptic number.

391285125 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

391285125 is an abundant number, since it is smaller than the sum of its proper divisors (488315259).

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

391285125 is a wasteful number, since it uses less digits than its factorization.

391285125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4556 (or 4543 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 391285125 is about 19780.9283149199. The cubic root of 391285125 is about 731.4159824839.

It can be divided in two parts, 39128 and 5125, that added together give a triangular number (44253 = T₂₉₇).

The spelling of 391285125 in words is "three hundred ninety-one million, two hundred eighty-five thousand, one hundred twenty-five".