147221172 has 96 divisors (see below), whose sum is σ = 438905600. Its totient is φ = 41803776.

The previous prime is 147221171. The next prime is 147221189. The reversal of 147221172 is 271122741.

It is a happy number.

147221172 is a `hidden beast` number, since 1 + 472 + 21 + 172 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147221171) 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 31 ways as a sum of consecutive naturals, for example, 145404 + ... + 146412.

Almost surely, 2^147221172 is an apocalyptic number.

147221172 is a gapful number since it is divisible by the number (12) 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 147221172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219452800).

147221172 is an abundant number, since it is smaller than the sum of its proper divisors (291684428).

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

147221172 is a wasteful number, since it uses less digits than its factorization.

147221172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222 (or 1214 counting only the distinct ones).

The product of its digits is 1568, while the sum is 27.

The square root of 147221172 is about 12133.4732043220. The cubic root of 147221172 is about 528.0277619700.

The spelling of 147221172 in words is "one hundred forty-seven million, two hundred twenty-one thousand, one hundred seventy-two".