109565440 has 80 divisors (see below), whose sum is σ = 265554432. Its totient is φ = 43352064.

The previous prime is 109565371. The next prime is 109565441. The reversal of 109565440 is 44565901.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 109565396 and 109565405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109565441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324952 + ... + 325288.

Almost surely, 2^109565440 is an apocalyptic number.

109565440 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 109565440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132777216).

109565440 is an abundant number, since it is smaller than the sum of its proper divisors (155988992).

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

109565440 is an equidigital number, since it uses as much as digits as its factorization.

109565440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 109565440 is about 10467.3511453471. The cubic root of 109565440 is about 478.5101956047.

The spelling of 109565440 in words is "one hundred nine million, five hundred sixty-five thousand, four hundred forty".