17994739 has 4 divisors (see below), whose sum is σ = 20565424. Its totient is φ = 15424056.

The previous prime is 17994731. The next prime is 17994791. The reversal of 17994739 is 93749971.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 17994739 - 2³ = 17994731 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17994692 and 17994701.

It is not an unprimeable number, because it can be changed into a prime (17994731) 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 3 ways as a sum of consecutive naturals, for example, 1285332 + ... + 1285345.

It is an arithmetic number, because the mean of its divisors is an integer number (5141356).

Almost surely, 2^17994739 is an apocalyptic number.

17994739 is a deficient number, since it is larger than the sum of its proper divisors (2570685).

17994739 is an equidigital number, since it uses as much as digits as its factorization.

17994739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570684.

The product of its digits is 428652, while the sum is 49.

The square root of 17994739 is about 4242.0206270126. The cubic root of 17994739 is about 262.0486041172.

The spelling of 17994739 in words is "seventeen million, nine hundred ninety-four thousand, seven hundred thirty-nine".