19797613 has 4 divisors (see below), whose sum is σ = 21597408. Its totient is φ = 17997820.

The previous prime is 19797581. The next prime is 19797619. The reversal of 19797613 is 31679791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19797613 - 2⁵ = 19797581 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 19797613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19797619) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 899881 + ... + 899902.

It is an arithmetic number, because the mean of its divisors is an integer number (5399352).

Almost surely, 2^19797613 is an apocalyptic number.

It is an amenable number.

19797613 is a deficient number, since it is larger than the sum of its proper divisors (1799795).

19797613 is a wasteful number, since it uses less digits than its factorization.

19797613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799794.

The product of its digits is 71442, while the sum is 43.

The square root of 19797613 is about 4449.4508649945. The cubic root of 19797613 is about 270.5230510068.

The spelling of 19797613 in words is "nineteen million, seven hundred ninety-seven thousand, six hundred thirteen".