172172426 has 4 divisors (see below), whose sum is σ = 258258642. Its totient is φ = 86086212.

The previous prime is 172172401. The next prime is 172172437. The reversal of 172172426 is 624271271.

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., 161315401 + 10857025 = 12701^2 + 3295^2 .

It is a junction number, because it is equal to n+sod(n) for n = 172172392 and 172172401.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43043105 + ... + 43043108.

Almost surely, 2^172172426 is an apocalyptic number.

172172426 is a deficient number, since it is larger than the sum of its proper divisors (86086216).

172172426 is an equidigital number, since it uses as much as digits as its factorization.

172172426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86086215.

The product of its digits is 9408, while the sum is 32.

The square root of 172172426 is about 13121.4490815611. The cubic root of 172172426 is about 556.3155503106.

It can be divided in two parts, 1721 and 72426, that added together give a palindrome (74147).

The spelling of 172172426 in words is "one hundred seventy-two million, one hundred seventy-two thousand, four hundred twenty-six".