32172140 has 96 divisors (see below), whose sum is σ = 90768384. Its totient is φ = 9250560.

The previous prime is 32172139. The next prime is 32172157. The reversal of 32172140 is 4127123.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 19217 + ... + 20823.

It is an arithmetic number, because the mean of its divisors is an integer number (945504).

Almost surely, 2^32172140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 32172140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45384192).

32172140 is an abundant number, since it is smaller than the sum of its proper divisors (58596244).

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

32172140 is a wasteful number, since it uses less digits than its factorization.

32172140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647 (or 1645 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 32172140 is about 5672.0490124822. The cubic root of 32172140 is about 318.0484743424.

Adding to 32172140 its reverse (4127123), we get a palindrome (36299263).

The spelling of 32172140 in words is "thirty-two million, one hundred seventy-two thousand, one hundred forty".