172543120 has 20 divisors (see below), whose sum is σ = 401162940. Its totient is φ = 69017216.

The previous prime is 172543109. The next prime is 172543141. The reversal of 172543120 is 21345271.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 113806224 + 58736896 = 10668^2 + 7664^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×172543120² = 59542256518668800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1078315 + ... + 1078474.

It is an arithmetic number, because the mean of its divisors is an integer number (20058147).

Almost surely, 2^172543120 is an apocalyptic number.

172543120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172543120 is an abundant number, since it is smaller than the sum of its proper divisors (228619820).

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

172543120 is a wasteful number, since it uses less digits than its factorization.

172543120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156802 (or 2156796 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 172543120 is about 13135.5669843368. The cubic root of 172543120 is about 556.7145205295.

Adding to 172543120 its reverse (21345271), we get a palindrome (193888391).

The spelling of 172543120 in words is "one hundred seventy-two million, five hundred forty-three thousand, one hundred twenty".