18894149 has 2 divisors, whose sum is σ = 18894150. Its totient is φ = 18894148.

The previous prime is 18894143. The next prime is 18894173. The reversal of 18894149 is 94149881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14010049 + 4884100 = 3743^2 + 2210^2 .

It is a cyclic number.

It is not a de Polignac number, because 18894149 - 2⁴ = 18894133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18894143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9447074 + 9447075.

It is an arithmetic number, because the mean of its divisors is an integer number (9447075).

Almost surely, 2^18894149 is an apocalyptic number.

It is an amenable number.

18894149 is a deficient number, since it is larger than the sum of its proper divisors (1).

18894149 is an equidigital number, since it uses as much as digits as its factorization.

18894149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 44.

The square root of 18894149 is about 4346.7400428367. The cubic root of 18894149 is about 266.3437102450.

The spelling of 18894149 in words is "eighteen million, eight hundred ninety-four thousand, one hundred forty-nine".