19439013 has 12 divisors (see below), whose sum is σ = 28489664. Its totient is φ = 11781000.

The previous prime is 19439009. The next prime is 19439027. The reversal of 19439013 is 31093491.

It is not a de Polignac number, because 19439013 - 2² = 19439009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19439083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26413 + ... + 27138.

Almost surely, 2^19439013 is an apocalyptic number.

It is an amenable number.

19439013 is a deficient number, since it is larger than the sum of its proper divisors (9050651).

19439013 is a wasteful number, since it uses less digits than its factorization.

19439013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53576 (or 53565 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 19439013 is about 4408.9696075160. The cubic root of 19439013 is about 268.8797341542.

The spelling of 19439013 in words is "nineteen million, four hundred thirty-nine thousand, thirteen".