172944389 has 4 divisors (see below), whose sum is σ = 173200524. Its totient is φ = 172688256.

The previous prime is 172944379. The next prime is 172944407. The reversal of 172944389 is 983449271.

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

It can be written as a sum of positive squares in 2 ways, for example, as 119727364 + 53217025 = 10942^2 + 7295^2 .

It is a cyclic number.

It is not a de Polignac number, because 172944389 - 2¹² = 172940293 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 (172944379) 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, 127052 + ... + 128405.

It is an arithmetic number, because the mean of its divisors is an integer number (43300131).

Almost surely, 2^172944389 is an apocalyptic number.

It is an amenable number.

172944389 is a deficient number, since it is larger than the sum of its proper divisors (256135).

172944389 is an equidigital number, since it uses as much as digits as its factorization.

172944389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256134.

The product of its digits is 435456, while the sum is 47.

The square root of 172944389 is about 13150.8322550324. The cubic root of 172944389 is about 557.1457544291.

The spelling of 172944389 in words is "one hundred seventy-two million, nine hundred forty-four thousand, three hundred eighty-nine".