1224921 has 8 divisors (see below), whose sum is σ = 1641280. Its totient is φ = 812592.

The previous prime is 1224919. The next prime is 1224943. The reversal of 1224921 is 1294221.

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

It is not a de Polignac number, because 1224921 - 2¹ = 1224919 is a prime.

It is a Duffinian number.

1224921 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224991) 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 + ... + 1578.

It is an arithmetic number, because the mean of its divisors is an integer number (205160).

2^1224921 is an apocalyptic number.

It is an amenable number.

1224921 is a deficient number, since it is larger than the sum of its proper divisors (416359).

1224921 is a wasteful number, since it uses less digits than its factorization.

1224921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015.

The product of its digits is 288, while the sum is 21.

The square root of 1224921 is about 1106.7614919214. The cubic root of 1224921 is about 106.9964478979.

It can be divided in two parts, 1224 and 921, that added together give a triangular number (2145 = T₆₅).

The spelling of 1224921 in words is "one million, two hundred twenty-four thousand, nine hundred twenty-one".