17928139 has 4 divisors (see below), whose sum is σ = 18180720. Its totient is φ = 17675560.

The previous prime is 17928133. The next prime is 17928161. The reversal of 17928139 is 93182971.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93182971 = 7 ⋅13311853.

It is a cyclic number.

It is not a de Polignac number, because 17928139 - 2⁷ = 17928011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17928133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126184 + ... + 126325.

It is an arithmetic number, because the mean of its divisors is an integer number (4545180).

Almost surely, 2^17928139 is an apocalyptic number.

17928139 is a deficient number, since it is larger than the sum of its proper divisors (252581).

17928139 is an equidigital number, since it uses as much as digits as its factorization.

17928139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252580.

The product of its digits is 27216, while the sum is 40.

The square root of 17928139 is about 4234.1633175871. The cubic root of 17928139 is about 261.7249166887.

The spelling of 17928139 in words is "seventeen million, nine hundred twenty-eight thousand, one hundred thirty-nine".