18049739 has 6 divisors (see below), whose sum is σ = 18444204. Its totient is φ = 17663540.

The previous prime is 18049729. The next prime is 18049763. The reversal of 18049739 is 93794081.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-18049739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18049696 and 18049705.

It is not an unprimeable number, because it can be changed into a prime (18049709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1877 + ... + 6294.

It is an arithmetic number, because the mean of its divisors is an integer number (3074034).

Almost surely, 2^18049739 is an apocalyptic number.

18049739 is a deficient number, since it is larger than the sum of its proper divisors (394465).

18049739 is an frugal number, since it uses more digits than its factorization.

18049739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8265 (or 8218 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 18049739 is about 4248.4984406258. The cubic root of 18049739 is about 262.3153119634.

The spelling of 18049739 in words is "eighteen million, forty-nine thousand, seven hundred thirty-nine".