3891685 has 8 divisors (see below), whose sum is σ = 5337216. Its totient is φ = 2668560.

The previous prime is 3891683. The next prime is 3891689. The reversal of 3891685 is 5861983.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3891685 - 2¹ = 3891683 is a prime.

It is a Duffinian number.

3891685 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3891683) 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 7 ways as a sum of consecutive naturals, for example, 55561 + ... + 55630.

It is an arithmetic number, because the mean of its divisors is an integer number (667152).

Almost surely, 2^3891685 is an apocalyptic number.

3891685 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3891685 is a deficient number, since it is larger than the sum of its proper divisors (1445531).

3891685 is a wasteful number, since it uses less digits than its factorization.

3891685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111203.

The product of its digits is 51840, while the sum is 40.

The square root of 3891685 is about 1972.7354105404. The cubic root of 3891685 is about 157.2941461143.

The spelling of 3891685 in words is "three million, eight hundred ninety-one thousand, six hundred eighty-five".