172994389 has 4 divisors (see below), whose sum is σ = 173192524. Its totient is φ = 172796256.

The previous prime is 172994383. The next prime is 172994407. The reversal of 172994389 is 983499271.

It is a happy number.

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 164096100 + 8898289 = 12810^2 + 2983^2 .

It is a cyclic number.

It is not a de Polignac number, because 172994389 - 2¹¹ = 172992341 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 (172994383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97752 + ... + 99505.

It is an arithmetic number, because the mean of its divisors is an integer number (43298131).

Almost surely, 2^172994389 is an apocalyptic number.

It is an amenable number.

172994389 is a deficient number, since it is larger than the sum of its proper divisors (198135).

172994389 is an equidigital number, since it uses as much as digits as its factorization.

172994389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198134.

The product of its digits is 979776, while the sum is 52.

The square root of 172994389 is about 13152.7331380212. The cubic root of 172994389 is about 557.1994414431.

The spelling of 172994389 in words is "one hundred seventy-two million, nine hundred ninety-four thousand, three hundred eighty-nine".