18985411 has 4 divisors (see below), whose sum is σ = 19040472. Its totient is φ = 18930352.

The previous prime is 18985409. The next prime is 18985429. The reversal of 18985411 is 11458981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11458981 = 347 ⋅33023.

It is a cyclic number.

It is not a de Polignac number, because 18985411 - 2¹ = 18985409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18985441) 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, 27010 + ... + 27703.

It is an arithmetic number, because the mean of its divisors is an integer number (4760118).

Almost surely, 2^18985411 is an apocalyptic number.

18985411 is a deficient number, since it is larger than the sum of its proper divisors (55061).

18985411 is an equidigital number, since it uses as much as digits as its factorization.

18985411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55060.

The product of its digits is 11520, while the sum is 37.

The square root of 18985411 is about 4357.2251491058. The cubic root of 18985411 is about 266.7718503463.

The spelling of 18985411 in words is "eighteen million, nine hundred eighty-five thousand, four hundred eleven".