163440840 has 128 divisors (see below), whose sum is σ = 509224320. Its totient is φ = 41932800.

The previous prime is 163440821. The next prime is 163440841. The reversal of 163440840 is 48044361.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 163440798 and 163440807.

It is not an unprimeable number, because it can be changed into a prime (163440841) 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, 581500 + ... + 581780.

It is an arithmetic number, because the mean of its divisors is an integer number (3978315).

Almost surely, 2^163440840 is an apocalyptic number.

163440840 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 163440840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254612160).

163440840 is an abundant number, since it is smaller than the sum of its proper divisors (345783480).

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

163440840 is a wasteful number, since it uses less digits than its factorization.

163440840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463 (or 459 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 163440840 is about 12784.3983041831. The cubic root of 163440840 is about 546.7475704836.

The spelling of 163440840 in words is "one hundred sixty-three million, four hundred forty thousand, eight hundred forty".