3644021799 has 48 divisors (see below), whose sum is σ = 6185013120. Its totient is φ = 2043558720.

The previous prime is 3644021789. The next prime is 3644021807. The reversal of 3644021799 is 9971204463.

It is a happy number.

3644021799 is a `hidden beast` number, since 36 + 440 + 2 + 179 + 9 = 666.

It is not a de Polignac number, because 3644021799 - 2⁴ = 3644021783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3644021729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58357 + ... + 103409.

It is an arithmetic number, because the mean of its divisors is an integer number (128854440).

Almost surely, 2^3644021799 is an apocalyptic number.

3644021799 is a deficient number, since it is larger than the sum of its proper divisors (2540991321).

3644021799 is a wasteful number, since it uses less digits than its factorization.

3644021799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45132 (or 45129 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 3644021799 is about 60365.7336491490. The cubic root of 3644021799 is about 1538.8406688949.

The spelling of 3644021799 in words is "three billion, six hundred forty-four million, twenty-one thousand, seven hundred ninety-nine".