163540944 has 140 divisors (see below), whose sum is σ = 543212256. Its totient is φ = 46702656.

The previous prime is 163540943. The next prime is 163540957. The reversal of 163540944 is 449045361.

It is a super-2 number, since 2×163540944² = 53491280728822272, which contains 22 as substring.

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 = 163540899 and 163540908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163540943) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 80647 + ... + 82649.

Almost surely, 2^163540944 is an apocalyptic number.

163540944 is a gapful number since it is divisible by the number (14) 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 163540944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271606128).

163540944 is an abundant number, since it is smaller than the sum of its proper divisors (379671312).

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

163540944 is an equidigital number, since it uses as much as digits as its factorization.

163540944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2036 (or 2015 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 163540944 is about 12788.3127894183. The cubic root of 163540944 is about 546.8591714123.

The spelling of 163540944 in words is "one hundred sixty-three million, five hundred forty thousand, nine hundred forty-four".