3655980 has 72 divisors (see below), whose sum is σ = 11684400. Its totient is φ = 922752.

The previous prime is 3655957. The next prime is 3655987. The reversal of 3655980 is 895563.

3655980 is a `hidden beast` number, since 3 + 65 + 598 + 0 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 2886 + ... + 3954.

Almost surely, 2^3655980 is an apocalyptic number.

3655980 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 3655980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5842200).

3655980 is an abundant number, since it is smaller than the sum of its proper divisors (8028420).

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

3655980 is a wasteful number, since it uses less digits than its factorization.

3655980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103 (or 1098 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 3655980 is about 1912.0617144852. The cubic root of 3655980 is about 154.0522114526.

The spelling of 3655980 in words is "three million, six hundred fifty-five thousand, nine hundred eighty".