172212730 has 32 divisors (see below), whose sum is σ = 334627200. Its totient is φ = 63615552.

The previous prime is 172212727. The next prime is 172212739. The reversal of 172212730 is 37212271.

172212730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 172212695 and 172212704.

It is not an unprimeable number, because it can be changed into a prime (172212739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6240 + ... + 19579.

It is an arithmetic number, because the mean of its divisors is an integer number (10457100).

Almost surely, 2^172212730 is an apocalyptic number.

172212730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172212730 is a deficient number, since it is larger than the sum of its proper divisors (162414470).

172212730 is a wasteful number, since it uses less digits than its factorization.

172212730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25878.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 172212730 is about 13122.9847976747. The cubic root of 172212730 is about 556.3589563951.

The spelling of 172212730 in words is "one hundred seventy-two million, two hundred twelve thousand, seven hundred thirty".