19879643 has 24 divisors (see below), whose sum is σ = 24678720. Its totient is φ = 15921360.

The previous prime is 19879633. The next prime is 19879669. The reversal of 19879643 is 34697891.

It is not a de Polignac number, because 19879643 - 2⁴ = 19879627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19879633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121880 + ... + 122042.

It is an arithmetic number, because the mean of its divisors is an integer number (1028280).

Almost surely, 2^19879643 is an apocalyptic number.

19879643 is a deficient number, since it is larger than the sum of its proper divisors (4799077).

19879643 is a wasteful number, since it uses less digits than its factorization.

19879643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 320 counting only the distinct ones).

The product of its digits is 326592, while the sum is 47.

The square root of 19879643 is about 4458.6593276455. The cubic root of 19879643 is about 270.8961671544.

The spelling of 19879643 in words is "nineteen million, eight hundred seventy-nine thousand, six hundred forty-three".