18894133 has 2 divisors, whose sum is σ = 18894134. Its totient is φ = 18894132.

The previous prime is 18894091. The next prime is 18894137. The reversal of 18894133 is 33149881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12376324 + 6517809 = 3518^2 + 2553^2 .

It is a cyclic number.

It is not a de Polignac number, because 18894133 - 2⁹ = 18893621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18894092 and 18894101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18894137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9447066 + 9447067.

It is an arithmetic number, because the mean of its divisors is an integer number (9447067).

Almost surely, 2^18894133 is an apocalyptic number.

It is an amenable number.

18894133 is a deficient number, since it is larger than the sum of its proper divisors (1).

18894133 is an equidigital number, since it uses as much as digits as its factorization.

18894133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 18894133 is about 4346.7382023766. The cubic root of 18894133 is about 266.3436350630.

The spelling of 18894133 in words is "eighteen million, eight hundred ninety-four thousand, one hundred thirty-three".