172981440 has 112 divisors (see below), whose sum is σ = 610270560. Its totient is φ = 46126080.

The previous prime is 172981429. The next prime is 172981441. The reversal of 172981440 is 44189271.

172981440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 172981395 and 172981404.

It is not an unprimeable number, because it can be changed into a prime (172981441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1371 + ... + 18650.

Almost surely, 2^172981440 is an apocalyptic number.

172981440 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 172981440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305135280).

172981440 is an abundant number, since it is smaller than the sum of its proper divisors (437289120).

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

172981440 is a wasteful number, since it uses less digits than its factorization.

172981440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20047 (or 20031 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 172981440 is about 13152.2408737067. The cubic root of 172981440 is about 557.1855385730.

The spelling of 172981440 in words is "one hundred seventy-two million, nine hundred eighty-one thousand, four hundred forty".