19139281 has 8 divisors (see below), whose sum is σ = 22046720. Its totient is φ = 16275168.

The previous prime is 19139273. The next prime is 19139291. The reversal of 19139281 is 18293191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19139281 - 2³ = 19139273 is a prime.

It is a super-2 number, since 2×19139281² = 732624154393922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19139221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9876 + ... + 11653.

It is an arithmetic number, because the mean of its divisors is an integer number (2755840).

Almost surely, 2^19139281 is an apocalyptic number.

It is an amenable number.

19139281 is a deficient number, since it is larger than the sum of its proper divisors (2907439).

19139281 is a wasteful number, since it uses less digits than its factorization.

19139281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21663.

The product of its digits is 3888, while the sum is 34.

The square root of 19139281 is about 4374.8463973036. The cubic root of 19139281 is about 267.4906090394.

The spelling of 19139281 in words is "nineteen million, one hundred thirty-nine thousand, two hundred eighty-one".