3891705 has 16 divisors (see below), whose sum is σ = 6251904. Its totient is φ = 2067200.

The previous prime is 3891689. The next prime is 3891707. The reversal of 3891705 is 5071983.

It is not a de Polignac number, because 3891705 - 2⁴ = 3891689 is a prime.

It is a Curzon number.

3891705 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3891707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5692 + ... + 6338.

It is an arithmetic number, because the mean of its divisors is an integer number (390744).

Almost surely, 2^3891705 is an apocalyptic number.

It is an amenable number.

3891705 is a deficient number, since it is larger than the sum of its proper divisors (2360199).

3891705 is a wasteful number, since it uses less digits than its factorization.

3891705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 3891705 is about 1972.7404796374. The cubic root of 3891705 is about 157.2944155673.

The spelling of 3891705 in words is "three million, eight hundred ninety-one thousand, seven hundred five".