172072426 has 4 divisors (see below), whose sum is σ = 258108642. Its totient is φ = 86036212.

The previous prime is 172072421. The next prime is 172072441. The reversal of 172072426 is 624270271.

172072426 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.

It can be written as a sum of positive squares in only one way, i.e., 166384201 + 5688225 = 12899^2 + 2385^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (172072421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43018105 + ... + 43018108.

Almost surely, 2^172072426 is an apocalyptic number.

172072426 is a deficient number, since it is larger than the sum of its proper divisors (86036216).

172072426 is an equidigital number, since it uses as much as digits as its factorization.

172072426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86036215.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 172072426 is about 13117.6379733548. The cubic root of 172072426 is about 556.2078243325.

The spelling of 172072426 in words is "one hundred seventy-two million, seventy-two thousand, four hundred twenty-six".