172044394 has 4 divisors (see below), whose sum is σ = 258066594. Its totient is φ = 86022196.

The previous prime is 172044377. The next prime is 172044407. The reversal of 172044394 is 493440271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 493440271 = 17449 ⋅28279.

It can be written as a sum of positive squares in only one way, i.e., 90954369 + 81090025 = 9537^2 + 9005^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43011097 + ... + 43011100.

Almost surely, 2^172044394 is an apocalyptic number.

172044394 is a deficient number, since it is larger than the sum of its proper divisors (86022200).

172044394 is an equidigital number, since it uses as much as digits as its factorization.

172044394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86022199.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 172044394 is about 13116.5694447901. The cubic root of 172044394 is about 556.1776190969.

The spelling of 172044394 in words is "one hundred seventy-two million, forty-four thousand, three hundred ninety-four".