19664343 has 16 divisors (see below), whose sum is σ = 29288160. Its totient is φ = 13039488.

The previous prime is 19664341. The next prime is 19664357. The reversal of 19664343 is 34346691.

19664343 is a `hidden beast` number, since 1 + 9 + 6 + 643 + 4 + 3 = 666.

It is not a de Polignac number, because 19664343 - 2¹ = 19664341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19664298 and 19664307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19664341) 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 15 ways as a sum of consecutive naturals, for example, 3471 + ... + 7167.

It is an arithmetic number, because the mean of its divisors is an integer number (1830510).

Almost surely, 2^19664343 is an apocalyptic number.

19664343 is a deficient number, since it is larger than the sum of its proper divisors (9623817).

19664343 is a wasteful number, since it uses less digits than its factorization.

19664343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3903 (or 3897 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 19664343 is about 4434.4495712546. The cubic root of 19664343 is about 269.9146643899.

The spelling of 19664343 in words is "nineteen million, six hundred sixty-four thousand, three hundred forty-three".