3891889 has 4 divisors (see below), whose sum is σ = 3895924. Its totient is φ = 3887856.

The previous prime is 3891883. The next prime is 3891893. The reversal of 3891889 is 9881983.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2371600 + 1520289 = 1540^2 + 1233^2 .

It is a cyclic number.

It is not a de Polignac number, because 3891889 - 2⁵ = 3891857 is a prime.

It is a Duffinian number.

3891889 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3891883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379 + ... + 2815.

It is an arithmetic number, because the mean of its divisors is an integer number (973981).

Almost surely, 2^3891889 is an apocalyptic number.

It is an amenable number.

3891889 is a deficient number, since it is larger than the sum of its proper divisors (4035).

3891889 is a wasteful number, since it uses less digits than its factorization.

3891889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4034.

The product of its digits is 124416, while the sum is 46.

The square root of 3891889 is about 1972.7871147187. The cubic root of 3891889 is about 157.2968944907.

It can be divided in two parts, 389 and 1889, that added together give a triangular number (2278 = T₆₇).

The spelling of 3891889 in words is "three million, eight hundred ninety-one thousand, eight hundred eighty-nine".