3891000 has 64 divisors (see below), whose sum is σ = 12149280. Its totient is φ = 1036800.

The previous prime is 3890981. The next prime is 3891037. The reversal of 3891000 is 1983.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2352 + ... + 3648.

Almost surely, 2^3891000 is an apocalyptic number.

3891000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3891000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6074640).

3891000 is an abundant number, since it is smaller than the sum of its proper divisors (8258280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3891000 is a wasteful number, since it uses less digits than its factorization.

3891000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321 (or 1307 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 3891000 is about 1972.5617861046. The cubic root of 3891000 is about 157.2849167949.

Adding to 3891000 its reverse (1983), we get a palindrome (3892983).

The spelling of 3891000 in words is "three million, eight hundred ninety-one thousand".