172420306 has 8 divisors (see below), whose sum is σ = 262173564. Its totient is φ = 85029120.

The previous prime is 172420271. The next prime is 172420327. The reversal of 172420306 is 603024271.

172420306 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 169234081 + 3186225 = 13009^2 + 1785^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×172420306² = 59457523842267272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590335 + ... + 590626.

Almost surely, 2^172420306 is an apocalyptic number.

172420306 is a deficient number, since it is larger than the sum of its proper divisors (89753258).

172420306 is a wasteful number, since it uses less digits than its factorization.

172420306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181036.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 172420306 is about 13130.8912873422. The cubic root of 172420306 is about 556.5824017375.

Adding to 172420306 its reverse (603024271), we get a palindrome (775444577).

The spelling of 172420306 in words is "one hundred seventy-two million, four hundred twenty thousand, three hundred six".