7891049 has 4 divisors (see below), whose sum is σ = 7936836. Its totient is φ = 7845264.

The previous prime is 7891033. The next prime is 7891067. The reversal of 7891049 is 9401987.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3396649 + 4494400 = 1843^2 + 2120^2 .

It is a cyclic number.

It is not a de Polignac number, because 7891049 - 2⁴ = 7891033 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7891069) by changing a digit.

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, 22634 + ... + 22979.

It is an arithmetic number, because the mean of its divisors is an integer number (1984209).

Almost surely, 2^7891049 is an apocalyptic number.

It is an amenable number.

7891049 is a deficient number, since it is larger than the sum of its proper divisors (45787).

7891049 is a wasteful number, since it uses less digits than its factorization.

7891049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45786.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 7891049 is about 2809.1011017762. The cubic root of 7891049 is about 199.0879218905.

The spelling of 7891049 in words is "seven million, eight hundred ninety-one thousand, forty-nine".