18742739 has 2 divisors, whose sum is σ = 18742740. Its totient is φ = 18742738.

The previous prime is 18742727. The next prime is 18742741. The reversal of 18742739 is 93724781.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18742739 is a prime.

Together with 18742741, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18742696 and 18742705.

It is not a weakly prime, because it can be changed into another prime (18741739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9371369 + 9371370.

It is an arithmetic number, because the mean of its divisors is an integer number (9371370).

Almost surely, 2^18742739 is an apocalyptic number.

18742739 is a deficient number, since it is larger than the sum of its proper divisors (1).

18742739 is an equidigital number, since it uses as much as digits as its factorization.

18742739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 18742739 is about 4329.2885096745. The cubic root of 18742739 is about 265.6303446952.

The spelling of 18742739 in words is "eighteen million, seven hundred forty-two thousand, seven hundred thirty-nine".