3646818 has 48 divisors (see below), whose sum is σ = 9150336. Its totient is φ = 1028160.

The previous prime is 3646817. The next prime is 3646829. The reversal of 3646818 is 8186463.

It is a happy number.

3646818 is a `hidden beast` number, since 3 + 646 + 8 + 1 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3646817) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12838 + ... + 13118.

It is an arithmetic number, because the mean of its divisors is an integer number (190632).

Almost surely, 2^3646818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3646818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4575168).

3646818 is an abundant number, since it is smaller than the sum of its proper divisors (5503518).

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

3646818 is a wasteful number, since it uses less digits than its factorization.

3646818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 396 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 3646818 is about 1909.6643684166. The cubic root of 3646818 is about 153.9234172550.

The spelling of 3646818 in words is "three million, six hundred forty-six thousand, eight hundred eighteen".