7821995 has 4 divisors (see below), whose sum is σ = 9386400. Its totient is φ = 6257592.

The previous prime is 7821991. The next prime is 7822007. The reversal of 7821995 is 5991287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5991287 = 857 ⋅6991.

It is a cyclic number.

It is not a de Polignac number, because 7821995 - 2² = 7821991 is a prime.

It is a super-2 number, since 2×7821995² = 122367211560050, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (7821991) 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, 782195 + ... + 782204.

It is an arithmetic number, because the mean of its divisors is an integer number (2346600).

Almost surely, 2^7821995 is an apocalyptic number.

7821995 is a deficient number, since it is larger than the sum of its proper divisors (1564405).

7821995 is a wasteful number, since it uses less digits than its factorization.

7821995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564404.

The product of its digits is 45360, while the sum is 41.

The square root of 7821995 is about 2796.7829733463. The cubic root of 7821995 is about 198.5054849413.

The spelling of 7821995 in words is "seven million, eight hundred twenty-one thousand, nine hundred ninety-five".