3641821840 has 40 divisors (see below), whose sum is σ = 8835380928. Its totient is φ = 1393392000.

The previous prime is 3641821819. The next prime is 3641821871. The reversal of 3641821840 is 481281463.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 3641821840.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 987786 + ... + 991465.

Almost surely, 2^3641821840 is an apocalyptic number.

It is an amenable number.

3641821840 is an abundant number, since it is smaller than the sum of its proper divisors (5193559088).

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

3641821840 is a wasteful number, since it uses less digits than its factorization.

3641821840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979287 (or 1979281 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 3641821840 is about 60347.5089792445. The cubic root of 3641821840 is about 1538.5309316443.

The spelling of 3641821840 in words is "three billion, six hundred forty-one million, eight hundred twenty-one thousand, eight hundred forty".