8291440 has 20 divisors (see below), whose sum is σ = 19277784. Its totient is φ = 3316544.

The previous prime is 8291407. The next prime is 8291443. The reversal of 8291440 is 441928.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 8291399 and 8291408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8291443) 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 3 ways as a sum of consecutive naturals, for example, 51742 + ... + 51901.

Almost surely, 2^8291440 is an apocalyptic number.

8291440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8291440 is an abundant number, since it is smaller than the sum of its proper divisors (10986344).

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

8291440 is a wasteful number, since it uses less digits than its factorization.

8291440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103656 (or 103650 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 8291440 is about 2879.4860652554. The cubic root of 8291440 is about 202.3997573255.

The spelling of 8291440 in words is "eight million, two hundred ninety-one thousand, four hundred forty".