3881691 has 12 divisors (see below), whose sum is σ = 6116760. Its totient is φ = 2352480.

The previous prime is 3881671. The next prime is 3881699. The reversal of 3881691 is 1961883.

It is not a de Polignac number, because 3881691 - 2⁵ = 3881659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3881699) 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, 19506 + ... + 19703.

It is an arithmetic number, because the mean of its divisors is an integer number (509730).

Almost surely, 2^3881691 is an apocalyptic number.

3881691 is a deficient number, since it is larger than the sum of its proper divisors (2235069).

3881691 is a wasteful number, since it uses less digits than its factorization.

3881691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39226 (or 39223 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 3881691 is about 1970.2007511926. The cubic root of 3881691 is about 157.1593848417.

The spelling of 3881691 in words is "three million, eight hundred eighty-one thousand, six hundred ninety-one".