3781620 has 96 divisors (see below), whose sum is σ = 12096000. Its totient is φ = 980352.

The previous prime is 3781579. The next prime is 3781639. The reversal of 3781620 is 261873.

3781620 is a `hidden beast` number, since 37 + 8 + 1 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25306 + ... + 25454.

It is an arithmetic number, because the mean of its divisors is an integer number (126000).

Almost surely, 2^3781620 is an apocalyptic number.

3781620 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 3781620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6048000).

3781620 is an abundant number, since it is smaller than the sum of its proper divisors (8314380).

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

3781620 is a wasteful number, since it uses less digits than its factorization.

3781620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 3781620 is about 1944.6387839391. The cubic root of 3781620 is about 155.7970734234.

The spelling of 3781620 in words is "three million, seven hundred eighty-one thousand, six hundred twenty".