7868421 has 20 divisors (see below), whose sum is σ = 12824064. Its totient is φ = 4768200.

The previous prime is 7868381. The next prime is 7868423. The reversal of 7868421 is 1248687.

It is not a de Polignac number, because 7868421 - 2⁷ = 7868293 is a prime.

7868421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7868423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3525 + ... + 5306.

Almost surely, 2^7868421 is an apocalyptic number.

It is an amenable number.

7868421 is a deficient number, since it is larger than the sum of its proper divisors (4955643).

7868421 is a wasteful number, since it uses less digits than its factorization.

7868421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8854 (or 8845 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 7868421 is about 2805.0705873471. The cubic root of 7868421 is about 198.8974413244.

The spelling of 7868421 in words is "seven million, eight hundred sixty-eight thousand, four hundred twenty-one".