7860221 has 4 divisors (see below), whose sum is σ = 7867872. Its totient is φ = 7852572.

The previous prime is 7860217. The next prime is 7860241. The reversal of 7860221 is 1220687.

7860221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 7860221 - 2² = 7860217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7860211) 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, 1991 + ... + 4436.

It is an arithmetic number, because the mean of its divisors is an integer number (1966968).

Almost surely, 2^7860221 is an apocalyptic number.

It is an amenable number.

7860221 is a deficient number, since it is larger than the sum of its proper divisors (7651).

7860221 is a wasteful number, since it uses less digits than its factorization.

7860221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7650.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 7860221 is about 2803.6085675429. The cubic root of 7860221 is about 198.8283242843.

The spelling of 7860221 in words is "seven million, eight hundred sixty thousand, two hundred twenty-one".