172040705 has 8 divisors (see below), whose sum is σ = 206833704. Its totient is φ = 137376000.

The previous prime is 172040689. The next prime is 172040707. The reversal of 172040705 is 507040271.

It can be written as a sum of positive squares in 4 ways, for example, as 40043584 + 131997121 = 6328^2 + 11489^2 .

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

It is not a de Polignac number, because 172040705 - 2⁴ = 172040689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172040707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29096 + ... + 34505.

It is an arithmetic number, because the mean of its divisors is an integer number (25854213).

Almost surely, 2^172040705 is an apocalyptic number.

It is an amenable number.

172040705 is a deficient number, since it is larger than the sum of its proper divisors (34792999).

172040705 is an equidigital number, since it uses as much as digits as its factorization.

172040705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64147.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 172040705 is about 13116.4288203764. The cubic root of 172040705 is about 556.1736438557.

Adding to 172040705 its reverse (507040271), we get a palindrome (679080976).

The spelling of 172040705 in words is "one hundred seventy-two million, forty thousand, seven hundred five".