172143240 has 128 divisors (see below), whose sum is σ = 536146560. Its totient is φ = 44181504.

The previous prime is 172143229. The next prime is 172143259. The reversal of 172143240 is 42341271.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 172143240.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 608139 + ... + 608421.

It is an arithmetic number, because the mean of its divisors is an integer number (4188645).

Almost surely, 2^172143240 is an apocalyptic number.

172143240 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 172143240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268073280).

172143240 is an abundant number, since it is smaller than the sum of its proper divisors (364003320).

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

172143240 is a wasteful number, since it uses less digits than its factorization.

172143240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 172143240 is about 13120.3368859187. The cubic root of 172143240 is about 556.2841137181.

The spelling of 172143240 in words is "one hundred seventy-two million, one hundred forty-three thousand, two hundred forty".