3655988 has 36 divisors (see below), whose sum is σ = 7775712. Its totient is φ = 1496880.

The previous prime is 3655987. The next prime is 3656017. The reversal of 3655988 is 8895563.

It is a super-2 number, since 2×3655988² = 26732496512288, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3655987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4103 + ... + 4913.

It is an arithmetic number, because the mean of its divisors is an integer number (215992).

Almost surely, 2^3655988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3655988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3887856).

3655988 is an abundant number, since it is smaller than the sum of its proper divisors (4119724).

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

3655988 is a wasteful number, since it uses less digits than its factorization.

3655988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852 (or 843 counting only the distinct ones).

The product of its digits is 259200, while the sum is 44.

The square root of 3655988 is about 1912.0638064667. The cubic root of 3655988 is about 154.0523238180.

The spelling of 3655988 in words is "three million, six hundred fifty-five thousand, nine hundred eighty-eight".