18068939 has 8 divisors (see below), whose sum is σ = 21316608. Its totient is φ = 14987880.

The previous prime is 18068933. The next prime is 18068951. The reversal of 18068939 is 93986081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18068939 - 2⁴ = 18068923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18068939.

It is not an unprimeable number, because it can be changed into a prime (18068933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41417 + ... + 41850.

It is an arithmetic number, because the mean of its divisors is an integer number (2664576).

Almost surely, 2^18068939 is an apocalyptic number.

18068939 is a deficient number, since it is larger than the sum of its proper divisors (3247669).

18068939 is an equidigital number, since it uses as much as digits as its factorization.

18068939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83305.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 18068939 is about 4250.7574619119. The cubic root of 18068939 is about 262.4082896558.

The spelling of 18068939 in words is "eighteen million, sixty-eight thousand, nine hundred thirty-nine".