19713869 has 16 divisors (see below), whose sum is σ = 23073792. Its totient is φ = 16495488.

The previous prime is 19713853. The next prime is 19713871. The reversal of 19713869 is 96831791.

It is a cyclic number.

It is not a de Polignac number, because 19713869 - 2⁴ = 19713853 is a prime.

It is a super-2 number, since 2×19713869² = 777273261898322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19713809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88292 + ... + 88514.

It is an arithmetic number, because the mean of its divisors is an integer number (1442112).

Almost surely, 2^19713869 is an apocalyptic number.

It is an amenable number.

19713869 is a deficient number, since it is larger than the sum of its proper divisors (3359923).

19713869 is a wasteful number, since it uses less digits than its factorization.

19713869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476.

The product of its digits is 81648, while the sum is 44.

The square root of 19713869 is about 4440.0302926895. The cubic root of 19713869 is about 270.1410739675.

The spelling of 19713869 in words is "nineteen million, seven hundred thirteen thousand, eight hundred sixty-nine".