3861690 has 96 divisors (see below), whose sum is σ = 11228544. Its totient is φ = 846720.

The previous prime is 3861659. The next prime is 3861709. The reversal of 3861690 is 961683.

It is a super-2 number, since 2×3861690² = 29825299312200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54355 + ... + 54425.

It is an arithmetic number, because the mean of its divisors is an integer number (116964).

Almost surely, 2^3861690 is an apocalyptic number.

3861690 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3861690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5614272).

3861690 is an abundant number, since it is smaller than the sum of its proper divisors (7366854).

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

3861690 is a wasteful number, since it uses less digits than its factorization.

3861690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 3861690 is about 1965.1183170486. The cubic root of 3861690 is about 156.8889907259. Note that the first 3 decimals are identical.

The spelling of 3861690 in words is "three million, eight hundred sixty-one thousand, six hundred ninety".