172843940 has 12 divisors (see below), whose sum is σ = 362972316. Its totient is φ = 69137568.

The previous prime is 172843939. The next prime is 172843949. The reversal of 172843940 is 49348271.

It can be written as a sum of positive squares in 2 ways, for example, as 69089344 + 103754596 = 8312^2 + 10186^2 .

It is a junction number, because it is equal to n+sod(n) for n = 172843894 and 172843903.

It is not an unprimeable number, because it can be changed into a prime (172843949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4321079 + ... + 4321118.

It is an arithmetic number, because the mean of its divisors is an integer number (30247693).

Almost surely, 2^172843940 is an apocalyptic number.

172843940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172843940 is an abundant number, since it is smaller than the sum of its proper divisors (190128376).

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

172843940 is a wasteful number, since it uses less digits than its factorization.

172843940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8642206 (or 8642204 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 172843940 is about 13147.0125884172. The cubic root of 172843940 is about 557.0378670078.

The spelling of 172843940 in words is "one hundred seventy-two million, eight hundred forty-three thousand, nine hundred forty".