172399104 has 100 divisors (see below), whose sum is σ = 514689714. Its totient is φ = 57452544.

The previous prime is 172399081. The next prime is 172399133. The reversal of 172399104 is 401993271.

It can be written as a sum of positive squares in only one way, i.e., 149817600 + 22581504 = 12240^2 + 4752^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 39394 + ... + 43550.

Almost surely, 2^172399104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172399104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257344857).

172399104 is an abundant number, since it is smaller than the sum of its proper divisors (342290610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172399104 is an frugal number, since it uses more digits than its factorization.

172399104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4187 (or 4162 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 172399104 is about 13130.0839296632. The cubic root of 172399104 is about 556.5595870546.

The spelling of 172399104 in words is "one hundred seventy-two million, three hundred ninety-nine thousand, one hundred four".