172145900 has 36 divisors (see below), whose sum is σ = 377428968. Its totient is φ = 68144640.

The previous prime is 172145891. The next prime is 172145903. The reversal of 172145900 is 9541271.

172145900 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (172145903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 827 + ... + 18573.

It is an arithmetic number, because the mean of its divisors is an integer number (10484138).

Almost surely, 2^172145900 is an apocalyptic number.

172145900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172145900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188714484).

172145900 is an abundant number, since it is smaller than the sum of its proper divisors (205283068).

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

172145900 is a wasteful number, since it uses less digits than its factorization.

172145900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17858 (or 17851 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 172145900 is about 13120.4382548755. The cubic root of 172145900 is about 556.2869789834.

The spelling of 172145900 in words is "one hundred seventy-two million, one hundred forty-five thousand, nine hundred".