8187440 has 40 divisors (see below), whose sum is σ = 19405008. Its totient is φ = 3211520.

The previous prime is 8187427. The next prime is 8187449. The reversal of 8187440 is 447818.

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

It is a junction number, because it is equal to n+sod(n) for n = 8187397 and 8187406.

It is not an unprimeable number, because it can be changed into a prime (8187449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3275 + ... + 5205.

Almost surely, 2^8187440 is an apocalyptic number.

8187440 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 8187440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9702504).

8187440 is an abundant number, since it is smaller than the sum of its proper divisors (11217568).

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

8187440 is a wasteful number, since it uses less digits than its factorization.

8187440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997 (or 1991 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 8187440 is about 2861.3703010970. The cubic root of 8187440 is about 201.5499571347.

The spelling of 8187440 in words is "eight million, one hundred eighty-seven thousand, four hundred forty".