19744493 has 8 divisors (see below), whose sum is σ = 20300280. Its totient is φ = 19192320.

The previous prime is 19744471. The next prime is 19744513. The reversal of 19744493 is 39444791.

It can be written as a sum of positive squares in 4 ways, for example, as 1408969 + 18335524 = 1187^2 + 4282^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19744493 - 2¹⁸ = 19482349 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

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 19744493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19744393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13103 + ... + 14531.

It is an arithmetic number, because the mean of its divisors is an integer number (2537535).

Almost surely, 2^19744493 is an apocalyptic number.

It is an amenable number.

19744493 is a deficient number, since it is larger than the sum of its proper divisors (555787).

19744493 is a wasteful number, since it uses less digits than its factorization.

19744493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807.

The product of its digits is 108864, while the sum is 41.

The square root of 19744493 is about 4443.4775795541. The cubic root of 19744493 is about 270.2808828201.

The spelling of 19744493 in words is "nineteen million, seven hundred forty-four thousand, four hundred ninety-three".