18880173 has 18 divisors (see below), whose sum is σ = 29532906. Its totient is φ = 11617632.

The previous prime is 18880163. The next prime is 18880207. The reversal of 18880173 is 37108881.

It can be written as a sum of positive squares in 3 ways, for example, as 191844 + 18688329 = 438^2 + 4323^2 .

It is not a de Polignac number, because 18880173 - 2⁴ = 18880157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18880163) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4686 + ... + 7727.

It is an arithmetic number, because the mean of its divisors is an integer number (1640717).

Almost surely, 2^18880173 is an apocalyptic number.

18880173 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18880173 is a deficient number, since it is larger than the sum of its proper divisors (10652733).

18880173 is a wasteful number, since it uses less digits than its factorization.

18880173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12445 (or 12429 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 18880173 is about 4345.1321038606. The cubic root of 18880173 is about 266.2780225746.

The spelling of 18880173 in words is "eighteen million, eight hundred eighty thousand, one hundred seventy-three".