7821798 has 8 divisors (see below), whose sum is σ = 15643608. Its totient is φ = 2607264.

The previous prime is 7821797. The next prime is 7821799. The reversal of 7821798 is 8971287.

It is an interprime number because it is at equal distance from previous prime (7821797) and next prime (7821799).

It is a sphenic number, since it is the product of 3 distinct primes.

7821798 is an admirable number.

It is a super-2 number, since 2×7821798² = 122361047905608, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7821791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651811 + ... + 651822.

It is an arithmetic number, because the mean of its divisors is an integer number (1955451).

Almost surely, 2^7821798 is an apocalyptic number.

7821798 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

7821798 is a wasteful number, since it uses less digits than its factorization.

7821798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303638.

The product of its digits is 56448, while the sum is 42.

The square root of 7821798 is about 2796.7477540887. The cubic root of 7821798 is about 198.5038184479.

The spelling of 7821798 in words is "seven million, eight hundred twenty-one thousand, seven hundred ninety-eight".