3649980 has 48 divisors (see below), whose sum is σ = 10321920. Its totient is φ = 963648.

The previous prime is 3649967. The next prime is 3649981. The reversal of 3649980 is 899463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3649981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7381 + ... + 7859.

It is an arithmetic number, because the mean of its divisors is an integer number (215040).

Almost surely, 2^3649980 is an apocalyptic number.

3649980 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 3649980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5160960).

3649980 is an abundant number, since it is smaller than the sum of its proper divisors (6671940).

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

3649980 is a wasteful number, since it uses less digits than its factorization.

3649980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 3649980 is about 1910.4920832079. The cubic root of 3649980 is about 153.9678912088.

The spelling of 3649980 in words is "three million, six hundred forty-nine thousand, nine hundred eighty".