18709539 has 8 divisors (see below), whose sum is σ = 25126080. Its totient is φ = 12383016.

The previous prime is 18709519. The next prime is 18709573. The reversal of 18709539 is 93590781.

It is a happy number.

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

It is not a de Polignac number, because 18709539 - 2⁸ = 18709283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18709539.

It is not an unprimeable number, because it can be changed into a prime (18709519) by changing a digit.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22017 + ... + 22850.

It is an arithmetic number, because the mean of its divisors is an integer number (3140760).

Almost surely, 2^18709539 is an apocalyptic number.

18709539 is a deficient number, since it is larger than the sum of its proper divisors (6416541).

18709539 is a wasteful number, since it uses less digits than its factorization.

18709539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45009.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 18709539 is about 4325.4524618819. The cubic root of 18709539 is about 265.4734103269.

The spelling of 18709539 in words is "eighteen million, seven hundred nine thousand, five hundred thirty-nine".