7791898 has 4 divisors (see below), whose sum is σ = 11687850. Its totient is φ = 3895948.

The previous prime is 7791877. The next prime is 7791907. The reversal of 7791898 is 8981977.

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

It can be written as a sum of positive squares in only one way, i.e., 6135529 + 1656369 = 2477^2 + 1287^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1947973 + ... + 1947976.

Almost surely, 2^7791898 is an apocalyptic number.

7791898 is a deficient number, since it is larger than the sum of its proper divisors (3895952).

7791898 is a wasteful number, since it uses less digits than its factorization.

7791898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3895951.

The product of its digits is 254016, while the sum is 49.

The square root of 7791898 is about 2791.3971412180. The cubic root of 7791898 is about 198.2505585586.

The spelling of 7791898 in words is "seven million, seven hundred ninety-one thousand, eight hundred ninety-eight".