3881000 has 32 divisors (see below), whose sum is σ = 9083880. Its totient is φ = 1552000.

The previous prime is 3880999. The next prime is 3881021. The reversal of 3881000 is 1883.

It can be written as a sum of positive squares in 4 ways, for example, as 1378276 + 2502724 = 1174^2 + 1582^2 .

It is a super-2 number, since 2×3881000² = 30124322000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 941 + ... + 2940.

Almost surely, 2^3881000 is an apocalyptic number.

It is an amenable number.

3881000 is an abundant number, since it is smaller than the sum of its proper divisors (5202880).

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

3881000 is a wasteful number, since it uses less digits than its factorization.

3881000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3902 (or 3888 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 3881000 is about 1970.0253805472. The cubic root of 3881000 is about 157.1500587018.

Adding to 3881000 its reverse (1883), we get a palindrome (3882883).

The spelling of 3881000 in words is "three million, eight hundred eighty-one thousand".