18949349 has 2 divisors, whose sum is σ = 18949350. Its totient is φ = 18949348.

The previous prime is 18949331. The next prime is 18949351. The reversal of 18949349 is 94394981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16120225 + 2829124 = 4015^2 + 1682^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18949349 is a prime.

It is a Sophie Germain prime.

Together with 18949351, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18949549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9474674 + 9474675.

It is an arithmetic number, because the mean of its divisors is an integer number (9474675).

Almost surely, 2^18949349 is an apocalyptic number.

It is an amenable number.

18949349 is a deficient number, since it is larger than the sum of its proper divisors (1).

18949349 is an equidigital number, since it uses as much as digits as its factorization.

18949349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 18949349 is about 4353.0849980215. The cubic root of 18949349 is about 266.6028359376.

The spelling of 18949349 in words is "eighteen million, nine hundred forty-nine thousand, three hundred forty-nine".