18923839 has 8 divisors (see below), whose sum is σ = 21858768. Its totient is φ = 16191360.

The previous prime is 18923833. The next prime is 18923851. The reversal of 18923839 is 93832981.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18923839 - 2³ = 18923831 is a prime.

It is a super-2 number, since 2×18923839² = 716223364995842, 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 = 18923795 and 18923804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18923831) 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 7 ways as a sum of consecutive naturals, for example, 50412 + ... + 50785.

It is an arithmetic number, because the mean of its divisors is an integer number (2732346).

Almost surely, 2^18923839 is an apocalyptic number.

18923839 is a deficient number, since it is larger than the sum of its proper divisors (2934929).

18923839 is a wasteful number, since it uses less digits than its factorization.

18923839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101225.

The product of its digits is 93312, while the sum is 43.

The square root of 18923839 is about 4350.1539053234. The cubic root of 18923839 is about 266.4831468210.

The spelling of 18923839 in words is "eighteen million, nine hundred twenty-three thousand, eight hundred thirty-nine".