18917485 has 4 divisors (see below), whose sum is σ = 22700988. Its totient is φ = 15133984.

The previous prime is 18917467. The next prime is 18917489. The reversal of 18917485 is 58471981.

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 9418761 + 9498724 = 3069^2 + 3082^2 .

It is a cyclic number.

It is not a de Polignac number, because 18917485 - 2⁹ = 18916973 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 (18917489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1891744 + ... + 1891753.

It is an arithmetic number, because the mean of its divisors is an integer number (5675247).

Almost surely, 2^18917485 is an apocalyptic number.

It is an amenable number.

18917485 is a deficient number, since it is larger than the sum of its proper divisors (3783503).

18917485 is an equidigital number, since it uses as much as digits as its factorization.

18917485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3783502.

The product of its digits is 80640, while the sum is 43.

The square root of 18917485 is about 4349.4235250203. The cubic root of 18917485 is about 266.4533180697.

The spelling of 18917485 in words is "eighteen million, nine hundred seventeen thousand, four hundred eighty-five".