8171440 has 40 divisors (see below), whose sum is σ = 19829088. Its totient is φ = 3125760.

The previous prime is 8171437. The next prime is 8171447. The reversal of 8171440 is 441718.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (8171447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381 + ... + 4060.

Almost surely, 2^8171440 is an apocalyptic number.

8171440 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 8171440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9914544).

8171440 is an abundant number, since it is smaller than the sum of its proper divisors (11657648).

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

8171440 is a wasteful number, since it uses less digits than its factorization.

8171440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4477 (or 4471 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 8171440 is about 2858.5730706071. The cubic root of 8171440 is about 201.4185810169.

The spelling of 8171440 in words is "eight million, one hundred seventy-one thousand, four hundred forty".