18049039 has 4 divisors (see below), whose sum is σ = 18057600. Its totient is φ = 18040480.

The previous prime is 18049021. The next prime is 18049079. The reversal of 18049039 is 93094081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 93094081 = 331 ⋅281251.

It is a cyclic number.

It is not a de Polignac number, because 18049039 - 2¹⁷ = 17917967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18048995 and 18049013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18049079) 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 in 3 ways as a sum of consecutive naturals, for example, 1362 + ... + 6160.

It is an arithmetic number, because the mean of its divisors is an integer number (4514400).

Almost surely, 2^18049039 is an apocalyptic number.

18049039 is a deficient number, since it is larger than the sum of its proper divisors (8561).

18049039 is an equidigital number, since it uses as much as digits as its factorization.

18049039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8560.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 18049039 is about 4248.4160577797. The cubic root of 18049039 is about 262.3119209062.

The spelling of 18049039 in words is "eighteen million, forty-nine thousand, thirty-nine".