8671440 has 40 divisors (see below), whose sum is σ = 26882208. Its totient is φ = 2312320.

The previous prime is 8671427. The next prime is 8671441. The reversal of 8671440 is 441768.

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

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 8671398 and 8671407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8671441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17826 + ... + 18305.

Almost surely, 2^8671440 is an apocalyptic number.

8671440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8671440 is an abundant number, since it is smaller than the sum of its proper divisors (18210768).

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

8671440 is a wasteful number, since it uses less digits than its factorization.

8671440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36147 (or 36141 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 8671440 is about 2944.7308875345. The cubic root of 8671440 is about 205.4457088067.

The spelling of 8671440 in words is "eight million, six hundred seventy-one thousand, four hundred forty".