172939998 has 128 divisors (see below), whose sum is σ = 452468736. Its totient is φ = 42768000.

The previous prime is 172939981. The next prime is 172939999. The reversal of 172939998 is 899939271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172939999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1145223 + ... + 1145373.

It is an arithmetic number, because the mean of its divisors is an integer number (3534912).

Almost surely, 2^172939998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172939998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226234368).

172939998 is an abundant number, since it is smaller than the sum of its proper divisors (279528738).

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

172939998 is a wasteful number, since it uses less digits than its factorization.

172939998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278.

The product of its digits is 2204496, while the sum is 57.

The square root of 172939998 is about 13150.6653063638. The cubic root of 172939998 is about 557.1410391412.

The spelling of 172939998 in words is "one hundred seventy-two million, nine hundred thirty-nine thousand, nine hundred ninety-eight".