18809139 has 16 divisors (see below), whose sum is σ = 26208000. Its totient is φ = 11983776.

The previous prime is 18809113. The next prime is 18809159. The reversal of 18809139 is 93190881.

It is a happy number.

It is not a de Polignac number, because 18809139 - 2¹¹ = 18807091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18809097 and 18809106.

It is not an unprimeable number, because it can be changed into a prime (18809159) 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 15 ways as a sum of consecutive naturals, for example, 7912 + ... + 10010.

It is an arithmetic number, because the mean of its divisors is an integer number (1638000).

Almost surely, 2^18809139 is an apocalyptic number.

18809139 is a deficient number, since it is larger than the sum of its proper divisors (7398861).

18809139 is a wasteful number, since it uses less digits than its factorization.

18809139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2234.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 18809139 is about 4336.9504262788. The cubic root of 18809139 is about 265.9436583330.

The spelling of 18809139 in words is "eighteen million, eight hundred nine thousand, one hundred thirty-nine".