3781644 has 24 divisors (see below), whose sum is σ = 8886528. Its totient is φ = 1251600.

The previous prime is 3781643. The next prime is 3781649. The reversal of 3781644 is 4461873.

It is not an unprimeable number, because it can be changed into a prime (3781643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 769 + ... + 2855.

It is an arithmetic number, because the mean of its divisors is an integer number (370272).

Almost surely, 2^3781644 is an apocalyptic number.

It is an amenable number.

3781644 is an abundant number, since it is smaller than the sum of its proper divisors (5104884).

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

3781644 is a wasteful number, since it uses less digits than its factorization.

3781644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245 (or 2243 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 3781644 is about 1944.6449547411. The cubic root of 3781644 is about 155.7974030107.

The spelling of 3781644 in words is "three million, seven hundred eighty-one thousand, six hundred forty-four".