19139988 has 72 divisors (see below), whose sum is σ = 53229792. Its totient is φ = 5334336.

The previous prime is 19139987. The next prime is 19139999. The reversal of 19139988 is 88993191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19139983) 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, 24906 + ... + 25662.

Almost surely, 2^19139988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19139988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26614896).

19139988 is an abundant number, since it is smaller than the sum of its proper divisors (34089804).

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

19139988 is a wasteful number, since it uses less digits than its factorization.

19139988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821 (or 812 counting only the distinct ones).

The product of its digits is 139968, while the sum is 48.

The square root of 19139988 is about 4374.9271993943. The cubic root of 19139988 is about 267.4939026764.

The spelling of 19139988 in words is "nineteen million, one hundred thirty-nine thousand, nine hundred eighty-eight".