19872438 has 24 divisors (see below), whose sum is σ = 40258104. Its totient is φ = 6539520.

The previous prime is 19872427. The next prime is 19872443. The reversal of 19872438 is 83427891.

It is a self number, because there is not a number n which added to its sum of digits gives 19872438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102870 + ... + 103062.

It is an arithmetic number, because the mean of its divisors is an integer number (1677421).

Almost surely, 2^19872438 is an apocalyptic number.

19872438 is an abundant number, since it is smaller than the sum of its proper divisors (20385666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19872438 is a wasteful number, since it uses less digits than its factorization.

19872438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460 (or 329 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 19872438 is about 4457.8512761195. The cubic root of 19872438 is about 270.8634361385.

The spelling of 19872438 in words is "nineteen million, eight hundred seventy-two thousand, four hundred thirty-eight".