17940005 has 8 divisors (see below), whose sum is σ = 22110072. Its totient is φ = 13963968.

The previous prime is 17939989. The next prime is 17940007. The reversal of 17940005 is 50004971.

It can be written as a sum of positive squares in 4 ways, for example, as 982081 + 16957924 = 991^2 + 4118^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 17940005 - 2⁴ = 17939989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17940007) 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, 48302 + ... + 48671.

It is an arithmetic number, because the mean of its divisors is an integer number (2763759).

Almost surely, 2^17940005 is an apocalyptic number.

It is an amenable number.

17940005 is a deficient number, since it is larger than the sum of its proper divisors (4170067).

17940005 is an equidigital number, since it uses as much as digits as its factorization.

17940005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97015.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 17940005 is about 4235.5643071496. The cubic root of 17940005 is about 261.7826461040.

Adding to 17940005 its reverse (50004971), we get a palindrome (67944976).

The spelling of 17940005 in words is "seventeen million, nine hundred forty thousand, five".