18450739 has 2 divisors, whose sum is σ = 18450740. Its totient is φ = 18450738.

The previous prime is 18450727. The next prime is 18450793. The reversal of 18450739 is 93705481.

Together with next prime (18450793) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (93705481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18450739 - 2¹³ = 18442547 is a prime.

It is a super-2 number, since 2×18450739² = 680859539292242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18450698 and 18450707.

It is not a weakly prime, because it can be changed into another prime (18450799) 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, 9225369 + 9225370.

It is an arithmetic number, because the mean of its divisors is an integer number (9225370).

Almost surely, 2^18450739 is an apocalyptic number.

18450739 is a deficient number, since it is larger than the sum of its proper divisors (1).

18450739 is an equidigital number, since it uses as much as digits as its factorization.

18450739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 18450739 is about 4295.4323414530. The cubic root of 18450739 is about 264.2436675535.

The spelling of 18450739 in words is "eighteen million, four hundred fifty thousand, seven hundred thirty-nine".