7991090 has 16 divisors (see below), whose sum is σ = 14599872. Its totient is φ = 3148464.

The previous prime is 7991089. The next prime is 7991099. The reversal of 7991090 is 901997.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7991090.

It is not an unprimeable number, because it can be changed into a prime (7991099) 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, 5294 + ... + 6633.

It is an arithmetic number, because the mean of its divisors is an integer number (912492).

Almost surely, 2^7991090 is an apocalyptic number.

7991090 is a deficient number, since it is larger than the sum of its proper divisors (6608782).

7991090 is a wasteful number, since it uses less digits than its factorization.

7991090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12001.

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 7991090 is about 2826.8516055853. The cubic root of 7991090 is about 199.9257224176.

The spelling of 7991090 in words is "seven million, nine hundred ninety-one thousand, ninety".