18729065 has 4 divisors (see below), whose sum is σ = 22474884. Its totient is φ = 14983248.

The previous prime is 18729059. The next prime is 18729091. The reversal of 18729065 is 56092781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4129024 + 14600041 = 2032^2 + 3821^2 .

It is a cyclic number.

It is not a de Polignac number, because 18729065 - 2⁴ = 18729049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1872902 + ... + 1872911.

It is an arithmetic number, because the mean of its divisors is an integer number (5618721).

Almost surely, 2^18729065 is an apocalyptic number.

It is an amenable number.

18729065 is a deficient number, since it is larger than the sum of its proper divisors (3745819).

18729065 is an equidigital number, since it uses as much as digits as its factorization.

18729065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3745818.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 18729065 is about 4327.7089782008. The cubic root of 18729065 is about 265.5657309977.

The spelling of 18729065 in words is "eighteen million, seven hundred twenty-nine thousand, sixty-five".