8161440 has 144 divisors (see below), whose sum is σ = 29992032. Its totient is φ = 1860096.

The previous prime is 8161429. The next prime is 8161451. The reversal of 8161440 is 441618.

8161440 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (8161429) and next prime (8161451).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 8161440.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23347 + ... + 23693.

It is an arithmetic number, because the mean of its divisors is an integer number (208278).

Almost surely, 2^8161440 is an apocalyptic number.

8161440 is a gapful number since it is divisible by the number (80) 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 8161440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14996016).

8161440 is an abundant number, since it is smaller than the sum of its proper divisors (21830592).

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

8161440 is a wasteful number, since it uses less digits than its factorization.

8161440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 8161440 is about 2856.8234107134. The cubic root of 8161440 is about 201.3363838356.

The spelling of 8161440 in words is "eight million, one hundred sixty-one thousand, four hundred forty".