19147139 has 4 divisors (see below), whose sum is σ = 20887800. Its totient is φ = 17406480.

The previous prime is 19147133. The next prime is 19147147. The reversal of 19147139 is 93174191.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93174191 = 11 ⋅8470381.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19147139 is a prime.

It is a super-2 number, since 2×19147139² = 733225863770642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19147099 and 19147108.

It is not an unprimeable number, because it can be changed into a prime (19147133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 870314 + ... + 870335.

It is an arithmetic number, because the mean of its divisors is an integer number (5221950).

Almost surely, 2^19147139 is an apocalyptic number.

19147139 is a deficient number, since it is larger than the sum of its proper divisors (1740661).

19147139 is a wasteful number, since it uses less digits than its factorization.

19147139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740660.

The product of its digits is 6804, while the sum is 35.

The square root of 19147139 is about 4375.7443938146. The cubic root of 19147139 is about 267.5272118356.

The spelling of 19147139 in words is "nineteen million, one hundred forty-seven thousand, one hundred thirty-nine".