18948213 has 6 divisors (see below), whose sum is σ = 27369654. Its totient is φ = 12632136.

The previous prime is 18948211. The next prime is 18948221. The reversal of 18948213 is 31284981.

It can be written as a sum of positive squares in only one way, i.e., 15421329 + 3526884 = 3927^2 + 1878^2 .

It is not a de Polignac number, because 18948213 - 2¹ = 18948211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18948211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1052670 + ... + 1052687.

It is an arithmetic number, because the mean of its divisors is an integer number (4561609).

Almost surely, 2^18948213 is an apocalyptic number.

It is an amenable number.

18948213 is a deficient number, since it is larger than the sum of its proper divisors (8421441).

18948213 is a wasteful number, since it uses less digits than its factorization.

18948213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105363 (or 2105360 counting only the distinct ones).

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

The square root of 18948213 is about 4352.9545138905. The cubic root of 18948213 is about 266.5975082810.

The spelling of 18948213 in words is "eighteen million, nine hundred forty-eight thousand, two hundred thirteen".