18939365 has 8 divisors (see below), whose sum is σ = 22929048. Its totient is φ = 15016960.

The previous prime is 18939353. The next prime is 18939367. The reversal of 18939365 is 56393981.

It can be written as a sum of positive squares in 4 ways, for example, as 268324 + 18671041 = 518^2 + 4321^2 .

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

It is not a de Polignac number, because 18939365 - 2¹² = 18935269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18939367) 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, 16196 + ... + 17325.

It is an arithmetic number, because the mean of its divisors is an integer number (2866131).

Almost surely, 2^18939365 is an apocalyptic number.

It is an amenable number.

18939365 is a deficient number, since it is larger than the sum of its proper divisors (3989683).

18939365 is a wasteful number, since it uses less digits than its factorization.

18939365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33639.

The product of its digits is 174960, while the sum is 44.

The square root of 18939365 is about 4351.9380740079. The cubic root of 18939365 is about 266.5560052994.

The spelling of 18939365 in words is "eighteen million, nine hundred thirty-nine thousand, three hundred sixty-five".