7221487 has 8 divisors (see below), whose sum is σ = 8888096. Its totient is φ = 5713632.

The previous prime is 7221457. The next prime is 7221499. The reversal of 7221487 is 7841227.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7221487 - 2¹⁹ = 6697199 is a prime.

7221487 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39588 + ... + 39769.

It is an arithmetic number, because the mean of its divisors is an integer number (1111012).

Almost surely, 2^7221487 is an apocalyptic number.

7221487 is a deficient number, since it is larger than the sum of its proper divisors (1666609).

7221487 is a wasteful number, since it uses less digits than its factorization.

7221487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79377.

The product of its digits is 6272, while the sum is 31.

The square root of 7221487 is about 2687.2824563116. The cubic root of 7221487 is about 193.2897738435.

It can be divided in two parts, 722 and 1487, that added together give a square (2209 = 47²).

The spelling of 7221487 in words is "seven million, two hundred twenty-one thousand, four hundred eighty-seven".