7821963 has 12 divisors (see below), whose sum is σ = 11322688. Its totient is φ = 5203440.

The previous prime is 7821959. The next prime is 7821971. The reversal of 7821963 is 3691287.

It is not a de Polignac number, because 7821963 - 2² = 7821959 is a prime.

It is a super-2 number, since 2×7821963² = 122366210346738, which contains 22 as substring.

It is a Duffinian number.

7821963 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7821563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7398 + ... + 8388.

Almost surely, 2^7821963 is an apocalyptic number.

7821963 is a deficient number, since it is larger than the sum of its proper divisors (3500725).

7821963 is a wasteful number, since it uses less digits than its factorization.

7821963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874 (or 1871 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 7821963 is about 2796.7772524819. Note that the first 3 decimals coincide. The cubic root of 7821963 is about 198.5052142438.

The spelling of 7821963 in words is "seven million, eight hundred twenty-one thousand, nine hundred sixty-three".