3644440493 has 4 divisors (see below), whose sum is σ = 3644632188. Its totient is φ = 3644248800.

The previous prime is 3644440487. The next prime is 3644440511. The reversal of 3644440493 is 3940444463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3940444463 = 37 ⋅106498499.

It can be written as a sum of positive squares in 2 ways, for example, as 390536644 + 3253903849 = 19762^2 + 57043^2 .

It is a cyclic number.

It is not a de Polignac number, because 3644440493 - 2²² = 3640246189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3644440493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3644440453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63746 + ... + 106547.

It is an arithmetic number, because the mean of its divisors is an integer number (911158047).

Almost surely, 2^3644440493 is an apocalyptic number.

It is an amenable number.

3644440493 is a deficient number, since it is larger than the sum of its proper divisors (191695).

3644440493 is a wasteful number, since it uses less digits than its factorization.

3644440493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191694.

The product of its (nonzero) digits is 497664, while the sum is 41.

The square root of 3644440493 is about 60369.2015269376. The cubic root of 3644440493 is about 1538.8996036576.

The spelling of 3644440493 in words is "three billion, six hundred forty-four million, four hundred forty thousand, four hundred ninety-three".