18933413 has 4 divisors (see below), whose sum is σ = 18950988. Its totient is φ = 18915840.

The previous prime is 18933407. The next prime is 18933449. The reversal of 18933413 is 31433981.

It is a happy number.

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 5987809 + 12945604 = 2447^2 + 3598^2 .

It is a cyclic number.

It is not a de Polignac number, because 18933413 - 2¹⁴ = 18917029 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18933413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18933403) 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 3 ways as a sum of consecutive naturals, for example, 7058 + ... + 9363.

It is an arithmetic number, because the mean of its divisors is an integer number (4737747).

Almost surely, 2^18933413 is an apocalyptic number.

It is an amenable number.

18933413 is a deficient number, since it is larger than the sum of its proper divisors (17575).

18933413 is a wasteful number, since it uses less digits than its factorization.

18933413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17574.

The product of its digits is 7776, while the sum is 32.

The square root of 18933413 is about 4351.2541870132. The cubic root of 18933413 is about 266.5280792034.

The spelling of 18933413 in words is "eighteen million, nine hundred thirty-three thousand, four hundred thirteen".