3665220 has 96 divisors (see below), whose sum is σ = 11440128.
Its totient is φ = 870912.
The previous prime is 3665203. The next prime is 3665227. The reversal of 3665220 is 225663.
3665220 = T105 + T106 + ... +
It is not an unprimeable number, because it can be changed into a prime (3665227) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28797 + ... + 28923.
It is an arithmetic number, because the mean of its divisors is an integer number (119168).
Almost surely, 23665220 is an apocalyptic number.
3665220 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 3665220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5720064).
3665220 is an abundant number, since it is smaller than the sum of its proper divisors (7774908).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
3665220 is a wasteful number, since it uses less digits than its factorization.
3665220 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 189 (or 187 counting only the distinct ones).
The product of its (nonzero) digits is 2160, while the sum is 24.
The square root of 3665220 is about 1914.4764297322.
The cubic root of 3665220 is about 154.1818843837.
It can be divided in two parts, 36 and 65220, that added together give a palindrome (65256).
The spelling of 3665220 in words is "three million, six hundred sixty-five thousand, two hundred twenty".