19923239 has 8 divisors (see below), whose sum is σ = 23090688. Its totient is φ = 16836120.

The previous prime is 19923227. The next prime is 19923259. The reversal of 19923239 is 93232991.

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

It is not a de Polignac number, because 19923239 - 2⁴ = 19923223 is a prime.

It is a super-2 number, since 2×19923239² = 793870904502242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19923259) 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, 19547 + ... + 20540.

It is an arithmetic number, because the mean of its divisors is an integer number (2886336).

Almost surely, 2^19923239 is an apocalyptic number.

19923239 is a deficient number, since it is larger than the sum of its proper divisors (3167449).

19923239 is an equidigital number, since it uses as much as digits as its factorization.

19923239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40165.

The product of its digits is 26244, while the sum is 38.

The square root of 19923239 is about 4463.5455637867. The cubic root of 19923239 is about 271.0940474133.

The spelling of 19923239 in words is "nineteen million, nine hundred twenty-three thousand, two hundred thirty-nine".