3691656 has 64 divisors (see below), whose sum is σ = 10430400. Its totient is φ = 1224720.

The previous prime is 3691627. The next prime is 3691657. The reversal of 3691656 is 6561963.

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

Its product of digits (29160) is a multiple of the sum of its prime divisors (216).

It is a self number, because there is not a number n which added to its sum of digits gives 3691656.

It is not an unprimeable number, because it can be changed into a prime (3691657) 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, 17391 + ... + 17601.

It is an arithmetic number, because the mean of its divisors is an integer number (162975).

Almost surely, 2^3691656 is an apocalyptic number.

3691656 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 3691656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5215200).

3691656 is an abundant number, since it is smaller than the sum of its proper divisors (6738744).

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

3691656 is an equidigital number, since it uses as much as digits as its factorization.

3691656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 216 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 3691656 is about 1921.3682624630. The cubic root of 3691656 is about 154.5516840941.

It can be divided in two parts, 369 and 1656, that added together give a square (2025 = 45²).

The spelling of 3691656 in words is "three million, six hundred ninety-one thousand, six hundred fifty-six".