163217440 has 24 divisors (see below), whose sum is σ = 385601580. Its totient is φ = 65286912.

The previous prime is 163217437. The next prime is 163217447. The reversal of 163217440 is 44712361.

It can be written as a sum of positive squares in 2 ways, for example, as 147185424 + 16032016 = 12132^2 + 4004^2 .

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 163217399 and 163217408.

It is not an unprimeable number, because it can be changed into a prime (163217447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509895 + ... + 510214.

Almost surely, 2^163217440 is an apocalyptic number.

163217440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163217440 is an abundant number, since it is smaller than the sum of its proper divisors (222384140).

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

163217440 is a wasteful number, since it uses less digits than its factorization.

163217440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020124 (or 1020116 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 163217440 is about 12775.6581043796. The cubic root of 163217440 is about 546.4983486034.

The spelling of 163217440 in words is "one hundred sixty-three million, two hundred seventeen thousand, four hundred forty".