8399640 has 32 divisors (see below), whose sum is σ = 25199280. Its totient is φ = 2239872.

The previous prime is 8399627. The next prime is 8399641. The reversal of 8399640 is 469938.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8399641) 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, 34879 + ... + 35118.

Almost surely, 2^8399640 is an apocalyptic number.

It is an amenable number.

8399640 is an abundant number, since it is smaller than the sum of its proper divisors (16799640).

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

8399640 is a wasteful number, since it uses less digits than its factorization.

8399640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70011 (or 70007 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 8399640 is about 2898.2132426721. The cubic root of 8399640 is about 203.2763673319.

The spelling of 8399640 in words is "eight million, three hundred ninety-nine thousand, six hundred forty".