18740149 has 2 divisors, whose sum is σ = 18740150. Its totient is φ = 18740148.

The previous prime is 18740123. The next prime is 18740153. The reversal of 18740149 is 94104781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16957924 + 1782225 = 4118^2 + 1335^2 .

It is a cyclic number.

It is not a de Polignac number, because 18740149 - 2⁷ = 18740021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18740849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9370074 + 9370075.

It is an arithmetic number, because the mean of its divisors is an integer number (9370075).

Almost surely, 2^18740149 is an apocalyptic number.

It is an amenable number.

18740149 is a deficient number, since it is larger than the sum of its proper divisors (1).

18740149 is an equidigital number, since it uses as much as digits as its factorization.

18740149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 18740149 is about 4328.9893739763. The cubic root of 18740149 is about 265.6181085917.

The spelling of 18740149 in words is "eighteen million, seven hundred forty thousand, one hundred forty-nine".