7900840 has 16 divisors (see below), whose sum is σ = 17776980. Its totient is φ = 3160320.

The previous prime is 7900829. The next prime is 7900859. The reversal of 7900840 is 480097.

It can be written as a sum of positive squares in 2 ways, for example, as 7257636 + 643204 = 2694^2 + 802^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7900799 and 7900808.

It is an unprimeable number.

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, 98721 + ... + 98800.

Almost surely, 2^7900840 is an apocalyptic number.

It is an amenable number.

7900840 is an abundant number, since it is smaller than the sum of its proper divisors (9876140).

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

7900840 is a wasteful number, since it uses less digits than its factorization.

7900840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197532 (or 197528 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 7900840 is about 2810.8432898331. The cubic root of 7900840 is about 199.1702288266.

The spelling of 7900840 in words is "seven million, nine hundred thousand, eight hundred forty".