3621721940 has 24 divisors (see below), whose sum is σ = 7850959872. Its totient is φ = 1401956640.

The previous prime is 3621721843. The next prime is 3621721967. The reversal of 3621721940 is 491271263.

It is a self number, because there is not a number n which added to its sum of digits gives 3621721940.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2920124 + ... + 2921363.

It is an arithmetic number, because the mean of its divisors is an integer number (327123328).

Almost surely, 2^3621721940 is an apocalyptic number.

It is an amenable number.

3621721940 is an abundant number, since it is smaller than the sum of its proper divisors (4229237932).

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

3621721940 is a wasteful number, since it uses less digits than its factorization.

3621721940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5841527 (or 5841525 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 3621721940 is about 60180.7439302639. The cubic root of 3621721940 is about 1535.6952277302.

The spelling of 3621721940 in words is "three billion, six hundred twenty-one million, seven hundred twenty-one thousand, nine hundred forty".