3891646 has 16 divisors (see below), whose sum is σ = 6645888. Its totient is φ = 1691800.

The previous prime is 3891593. The next prime is 3891659. The reversal of 3891646 is 6461983.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3340 + ... + 4351.

It is an arithmetic number, because the mean of its divisors is an integer number (415368).

Almost surely, 2^3891646 is an apocalyptic number.

3891646 is a deficient number, since it is larger than the sum of its proper divisors (2754242).

3891646 is a wasteful number, since it uses less digits than its factorization.

3891646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7727.

The product of its digits is 31104, while the sum is 37.

The square root of 3891646 is about 1972.7255257638. The cubic root of 3891646 is about 157.2936206785.

The spelling of 3891646 in words is "three million, eight hundred ninety-one thousand, six hundred forty-six".