18928413 has 24 divisors (see below), whose sum is σ = 31561088. Its totient is φ = 10707552.

The previous prime is 18928411. The next prime is 18928421. The reversal of 18928413 is 31482981.

It is not a de Polignac number, because 18928413 - 2¹ = 18928411 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18928411) 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 23 ways as a sum of consecutive naturals, for example, 5031 + ... + 7947.

Almost surely, 2^18928413 is an apocalyptic number.

It is an amenable number.

18928413 is a deficient number, since it is larger than the sum of its proper divisors (12632675).

18928413 is a wasteful number, since it uses less digits than its factorization.

18928413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033 (or 3030 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 18928413 is about 4350.6796020852. The cubic root of 18928413 is about 266.5046152578.

The spelling of 18928413 in words is "eighteen million, nine hundred twenty-eight thousand, four hundred thirteen".