1504221 has 8 divisors (see below), whose sum is σ = 2014464. Its totient is φ = 998400.

The previous prime is 1504187. The next prime is 1504231. The reversal of 1504221 is 1224051.

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

It is not a de Polignac number, because 1504221 - 2⁶ = 1504157 is a prime.

1504221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1504221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1504231) 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, 205 + ... + 1746.

It is an arithmetic number, because the mean of its divisors is an integer number (251808).

2^1504221 is an apocalyptic number.

It is an amenable number.

1504221 is a deficient number, since it is larger than the sum of its proper divisors (510243).

1504221 is a wasteful number, since it uses less digits than its factorization.

1504221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1504221 is about 1226.4668768458. The cubic root of 1504221 is about 114.5786978914.

Adding to 1504221 its reverse (1224051), we get a palindrome (2728272).

It can be divided in two parts, 150 and 4221, that added together give a triangular number (4371 = T₉₃).

The spelling of 1504221 in words is "one million, five hundred four thousand, two hundred twenty-one".