19239139 has 4 divisors (see below), whose sum is σ = 19270840. Its totient is φ = 19207440.

The previous prime is 19239137. The next prime is 19239161. The reversal of 19239139 is 93193291.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19239139 - 2¹ = 19239137 is a prime.

It is a super-2 number, since 2×19239139² = 740288938922642, 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 = 19239098 and 19239107.

It is not an unprimeable number, because it can be changed into a prime (19239131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14922 + ... + 16159.

It is an arithmetic number, because the mean of its divisors is an integer number (4817710).

Almost surely, 2^19239139 is an apocalyptic number.

19239139 is a deficient number, since it is larger than the sum of its proper divisors (31701).

19239139 is an equidigital number, since it uses as much as digits as its factorization.

19239139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31700.

The product of its digits is 13122, while the sum is 37.

The square root of 19239139 is about 4386.2442932422. The cubic root of 19239139 is about 267.9550074837.

The spelling of 19239139 in words is "nineteen million, two hundred thirty-nine thousand, one hundred thirty-nine".