172220829 has 32 divisors (see below), whose sum is σ = 272439936. Its totient is φ = 95569920.

The previous prime is 172220819. The next prime is 172220833. The reversal of 172220829 is 928022271.

172220829 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 172220829 - 2⁴ = 172220813 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 172220829.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172220809) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16609 + ... + 24905.

It is an arithmetic number, because the mean of its divisors is an integer number (8513748).

Almost surely, 2^172220829 is an apocalyptic number.

It is an amenable number.

172220829 is a deficient number, since it is larger than the sum of its proper divisors (100219107).

172220829 is a wasteful number, since it uses less digits than its factorization.

172220829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8365.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 172220829 is about 13123.2933747592. The cubic root of 172220829 is about 556.3676779349.

The spelling of 172220829 in words is "one hundred seventy-two million, two hundred twenty thousand, eight hundred twenty-nine".