18949739 has 2 divisors, whose sum is σ = 18949740. Its totient is φ = 18949738.

The previous prime is 18949729. The next prime is 18949741. The reversal of 18949739 is 93794981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18949739 - 2¹² = 18945643 is a prime.

Together with 18949741, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18949729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9474869 + 9474870.

It is an arithmetic number, because the mean of its divisors is an integer number (9474870).

Almost surely, 2^18949739 is an apocalyptic number.

18949739 is a deficient number, since it is larger than the sum of its proper divisors (1).

18949739 is an equidigital number, since it uses as much as digits as its factorization.

18949739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 50.

The square root of 18949739 is about 4353.1297936083. The cubic root of 18949739 is about 266.6046649256.

The spelling of 18949739 in words is "eighteen million, nine hundred forty-nine thousand, seven hundred thirty-nine".