18729339 has 8 divisors (see below), whose sum is σ = 25220112. Its totient is φ = 12362400.

The previous prime is 18729329. The next prime is 18729341. The reversal of 18729339 is 93392781.

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

It is not a de Polignac number, because 18729339 - 2¹³ = 18721147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18729339.

It is not an unprimeable number, because it can be changed into a prime (18729329) 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, 30604 + ... + 31209.

It is an arithmetic number, because the mean of its divisors is an integer number (3152514).

Almost surely, 2^18729339 is an apocalyptic number.

18729339 is a deficient number, since it is larger than the sum of its proper divisors (6490773).

18729339 is a wasteful number, since it uses less digits than its factorization.

18729339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61917.

The product of its digits is 81648, while the sum is 42.

The square root of 18729339 is about 4327.7406345575. The cubic root of 18729339 is about 265.5670260376.

It can be divided in two parts, 1872 and 9339, that added together give a palindrome (11211).

The spelling of 18729339 in words is "eighteen million, seven hundred twenty-nine thousand, three hundred thirty-nine".