172289940 has 96 divisors (see below), whose sum is σ = 501473280. Its totient is φ = 44150400.

The previous prime is 172289939. The next prime is 172289947. The reversal of 172289940 is 49982271.

172289940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 172289892 and 172289901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172289947) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 392241 + ... + 392679.

It is an arithmetic number, because the mean of its divisors is an integer number (5223680).

Almost surely, 2^172289940 is an apocalyptic number.

172289940 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 172289940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250736640).

172289940 is an abundant number, since it is smaller than the sum of its proper divisors (329183340).

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

172289940 is a wasteful number, since it uses less digits than its factorization.

172289940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 172289940 is about 13125.9262530307. The cubic root of 172289940 is about 556.4420901195.

The spelling of 172289940 in words is "one hundred seventy-two million, two hundred eighty-nine thousand, nine hundred forty".