3655638 has 64 divisors (see below), whose sum is σ = 9792000. Its totient is φ = 987552.

The previous prime is 3655633. The next prime is 3655649. The reversal of 3655638 is 8365563.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

Its product of digits (64800) is a multiple of the sum of its prime divisors (540).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3655633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6928 + ... + 7436.

It is an arithmetic number, because the mean of its divisors is an integer number (153000).

Almost surely, 2^3655638 is an apocalyptic number.

3655638 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 3655638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4896000).

3655638 is an abundant number, since it is smaller than the sum of its proper divisors (6136362).

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

3655638 is a wasteful number, since it uses less digits than its factorization.

3655638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 540 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 3655638 is about 1911.9722801338. The cubic root of 3655638 is about 154.0474076791.

The spelling of 3655638 in words is "three million, six hundred fifty-five thousand, six hundred thirty-eight".