172194389 has 4 divisors (see below), whose sum is σ = 172312140. Its totient is φ = 172076640.

The previous prime is 172194361. The next prime is 172194409. The reversal of 172194389 is 983491271.

172194389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 983491271 = 7 ⋅140498753.

It can be written as a sum of positive squares in 2 ways, for example, as 123432100 + 48762289 = 11110^2 + 6983^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172194389 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 (172194329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56654 + ... + 59615.

It is an arithmetic number, because the mean of its divisors is an integer number (43078035).

Almost surely, 2^172194389 is an apocalyptic number.

It is an amenable number.

172194389 is a deficient number, since it is larger than the sum of its proper divisors (117751).

172194389 is a wasteful number, since it uses less digits than its factorization.

172194389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117750.

The product of its digits is 108864, while the sum is 44.

The square root of 172194389 is about 13122.2859670105. The cubic root of 172194389 is about 556.3392045802.

The spelling of 172194389 in words is "one hundred seventy-two million, one hundred ninety-four thousand, three hundred eighty-nine".