7899440 has 40 divisors (see below), whose sum is σ = 19336560. Its totient is φ = 2992896.

The previous prime is 7899413. The next prime is 7899443. The reversal of 7899440 is 449987.

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

It is not an unprimeable number, because it can be changed into a prime (7899443) 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, 1079 + ... + 4118.

It is an arithmetic number, because the mean of its divisors is an integer number (483414).

Almost surely, 2^7899440 is an apocalyptic number.

It is an amenable number.

7899440 is an abundant number, since it is smaller than the sum of its proper divisors (11437120).

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

7899440 is a wasteful number, since it uses less digits than its factorization.

7899440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5229 (or 5223 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 7899440 is about 2810.5942432162. The cubic root of 7899440 is about 199.1584640526.

The spelling of 7899440 in words is "seven million, eight hundred ninety-nine thousand, four hundred forty".