3781000 has 64 divisors (see below), whose sum is σ = 9360000. Its totient is φ = 1425600.

The previous prime is 3780989. The next prime is 3781007. The reversal of 3781000 is 1873.

It is a super-2 number, since 2×3781000² = 28591922000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (3781007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18901 + ... + 19099.

It is an arithmetic number, because the mean of its divisors is an integer number (146250).

Almost surely, 2^3781000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3781000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4680000).

3781000 is an abundant number, since it is smaller than the sum of its proper divisors (5579000).

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

3781000 is a wasteful number, since it uses less digits than its factorization.

3781000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 3781000 is about 1944.4793647658. The cubic root of 3781000 is about 155.7885586012.

Adding to 3781000 its reverse (1873), we get a palindrome (3782873).

It can be divided in two parts, 378 and 1000, that added together give a triangular number (1378 = T₅₂).

The spelling of 3781000 in words is "three million, seven hundred eighty-one thousand".