3645918 has 32 divisors (see below), whose sum is σ = 8190720. Its totient is φ = 1202040.

The previous prime is 3645913. The next prime is 3645949. The reversal of 3645918 is 8195463.

3645918 is a `hidden beast` number, since 3 + 64 + 591 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3645913) 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, 5463 + ... + 6093.

It is an arithmetic number, because the mean of its divisors is an integer number (255960).

Almost surely, 2^3645918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3645918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4095360).

3645918 is an abundant number, since it is smaller than the sum of its proper divisors (4544802).

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

3645918 is a wasteful number, since it uses less digits than its factorization.

3645918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749 (or 743 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 3645918 is about 1909.4287103739. The cubic root of 3645918 is about 153.9107539347.

It can be divided in two parts, 36 and 45918, that added together give a palindrome (45954).

The spelling of 3645918 in words is "three million, six hundred forty-five thousand, nine hundred eighteen".