172120479 has 8 divisors (see below), whose sum is σ = 231034800. Its totient is φ = 113976576.

The previous prime is 172120447. The next prime is 172120517. The reversal of 172120479 is 974021271.

172120479 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 172120479 - 2⁵ = 172120447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172120409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192082 + ... + 192975.

It is an arithmetic number, because the mean of its divisors is an integer number (28879350).

Almost surely, 2^172120479 is an apocalyptic number.

172120479 is a deficient number, since it is larger than the sum of its proper divisors (58914321).

172120479 is a wasteful number, since it uses less digits than its factorization.

172120479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385209.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 172120479 is about 13119.4694633586. The cubic root of 172120479 is about 556.2595951044.

The spelling of 172120479 in words is "one hundred seventy-two million, one hundred twenty thousand, four hundred seventy-nine".