7905840 has 40 divisors (see below), whose sum is σ = 24508848. Its totient is φ = 2108160.

The previous prime is 7905839. The next prime is 7905847. The reversal of 7905840 is 485097.

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

It is a super-2 number, since 2×7905840² = 125004612211200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7905847) 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, 16231 + ... + 16710.

Almost surely, 2^7905840 is an apocalyptic number.

It is an amenable number.

7905840 is an abundant number, since it is smaller than the sum of its proper divisors (16603008).

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

7905840 is a wasteful number, since it uses less digits than its factorization.

7905840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32957 (or 32951 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 7905840 is about 2811.7325619625. The cubic root of 7905840 is about 199.2122345351.

The spelling of 7905840 in words is "seven million, nine hundred five thousand, eight hundred forty".