109443840 has 144 divisors (see below), whose sum is σ = 381459456. Its totient is φ = 26521600.

The previous prime is 109443827. The next prime is 109443847. The reversal of 109443840 is 48344901.

It is a happy number.

It is a super-2 number, since 2×109443840² = 23955908227891200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (109443847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40945 + ... + 43535.

It is an arithmetic number, because the mean of its divisors is an integer number (2649024).

Almost surely, 2^109443840 is an apocalyptic number.

109443840 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 109443840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190729728).

109443840 is an abundant number, since it is smaller than the sum of its proper divisors (272015616).

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

109443840 is a wasteful number, since it uses less digits than its factorization.

109443840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2626 (or 2612 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 109443840 is about 10461.5409954748. The cubic root of 109443840 is about 478.3331069805. Note that the first 3 decimals are identical.

The spelling of 109443840 in words is "one hundred nine million, four hundred forty-three thousand, eight hundred forty".