3781656 has 48 divisors (see below), whose sum is σ = 10445760. Its totient is φ = 1235520.

The previous prime is 3781649. The next prime is 3781663. The reversal of 3781656 is 6561873.

3781656 is nontrivially palindromic in base 7.

It is an interprime number because it is at equal distance from previous prime (3781649) and next prime (3781663).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 3781656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3321 + ... + 4311.

It is an arithmetic number, because the mean of its divisors is an integer number (217620).

Almost surely, 2^3781656 is an apocalyptic number.

3781656 is a gapful number since it is divisible by the number (36) 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 3781656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5222880).

3781656 is an abundant number, since it is smaller than the sum of its proper divisors (6664104).

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

3781656 is a wasteful number, since it uses less digits than its factorization.

3781656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056 (or 1049 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 3781656 is about 1944.6480401348. The cubic root of 3781656 is about 155.7975678038.

The spelling of 3781656 in words is "three million, seven hundred eighty-one thousand, six hundred fifty-six".