18928039 has 8 divisors (see below), whose sum is σ = 21087360. Its totient is φ = 16869216.

The previous prime is 18928033. The next prime is 18928043. The reversal of 18928039 is 93082981.

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

It is not a de Polignac number, because 18928039 - 2³ = 18928031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18927992 and 18928010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18928031) 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, 24727 + ... + 25480.

It is an arithmetic number, because the mean of its divisors is an integer number (2635920).

Almost surely, 2^18928039 is an apocalyptic number.

18928039 is a deficient number, since it is larger than the sum of its proper divisors (2159321).

18928039 is a wasteful number, since it uses less digits than its factorization.

18928039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50249.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 18928039 is about 4350.6366200822. The cubic root of 18928039 is about 266.5028599885.

The spelling of 18928039 in words is "eighteen million, nine hundred twenty-eight thousand, thirty-nine".