19044913 has 4 divisors (see below), whose sum is σ = 20165220. Its totient is φ = 17924608.

The previous prime is 19044901. The next prime is 19044919. The reversal of 19044913 is 31944091.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7969329 + 11075584 = 2823^2 + 3328^2 .

It is a cyclic number.

It is not a de Polignac number, because 19044913 - 2¹⁷ = 18913841 is a prime.

It is a super-2 number, since 2×19044913² = 725417422355138, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19044919) 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, 560128 + ... + 560161.

It is an arithmetic number, because the mean of its divisors is an integer number (5041305).

Almost surely, 2^19044913 is an apocalyptic number.

It is an amenable number.

19044913 is a deficient number, since it is larger than the sum of its proper divisors (1120307).

19044913 is a wasteful number, since it uses less digits than its factorization.

19044913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120306.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 19044913 is about 4364.0477770070. The cubic root of 19044913 is about 267.0502554245.

The spelling of 19044913 in words is "nineteen million, forty-four thousand, nine hundred thirteen".