4687221 has 32 divisors (see below), whose sum is σ = 7907328. Its totient is φ = 2399040.

The previous prime is 4687217. The next prime is 4687229. The reversal of 4687221 is 1227864.

It is not a de Polignac number, because 4687221 - 2² = 4687217 is a prime.

It is an Ulam number.

4687221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4687229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23695 + ... + 23891.

It is an arithmetic number, because the mean of its divisors is an integer number (247104).

Almost surely, 2^4687221 is an apocalyptic number.

It is an amenable number.

4687221 is a deficient number, since it is larger than the sum of its proper divisors (3220107).

4687221 is a wasteful number, since it uses less digits than its factorization.

4687221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321.

The product of its digits is 5376, while the sum is 30.

The square root of 4687221 is about 2164.9990762123. Note that the first 3 decimals coincide. The cubic root of 4687221 is about 167.3549170672.

The spelling of 4687221 in words is "four million, six hundred eighty-seven thousand, two hundred twenty-one".