18850905 has 12 divisors (see below), whose sum is σ = 32674980. Its totient is φ = 10053792.

The previous prime is 18850903. The next prime is 18850921. The reversal of 18850905 is 50905881.

It can be written as a sum of positive squares in 2 ways, for example, as 8020224 + 10830681 = 2832^2 + 3291^2 .

It is not a de Polignac number, because 18850905 - 2¹ = 18850903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18850905.

It is not an unprimeable number, because it can be changed into a prime (18850903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 209410 + ... + 209499.

It is an arithmetic number, because the mean of its divisors is an integer number (2722915).

Almost surely, 2^18850905 is an apocalyptic number.

18850905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18850905 is a deficient number, since it is larger than the sum of its proper divisors (13824075).

18850905 is a wasteful number, since it uses less digits than its factorization.

18850905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418920 (or 418917 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The square root of 18850905 is about 4341.7628908083. The cubic root of 18850905 is about 266.1403568912.

The spelling of 18850905 in words is "eighteen million, eight hundred fifty thousand, nine hundred five".