3665898 has 48 divisors (see below), whose sum is σ = 8692320. Its totient is φ = 1154736.

The previous prime is 3665881. The next prime is 3665899. The reversal of 3665898 is 8985663.

3665898 is a `hidden beast` number, since 3 + 66 + 589 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (3665899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9036 + ... + 9432.

It is an arithmetic number, because the mean of its divisors is an integer number (181090).

Almost surely, 2^3665898 is an apocalyptic number.

3665898 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3665898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4346160).

3665898 is an abundant number, since it is smaller than the sum of its proper divisors (5026422).

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

3665898 is a wasteful number, since it uses less digits than its factorization.

3665898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 421 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 3665898 is about 1914.6534934551. The cubic root of 3665898 is about 154.1913907592.

The spelling of 3665898 in words is "three million, six hundred sixty-five thousand, eight hundred ninety-eight".