1221753 has 8 divisors (see below), whose sum is σ = 1754368. Its totient is φ = 751824.

The previous prime is 1221751. The next prime is 1221761. The reversal of 1221753 is 3571221.

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

It is not a de Polignac number, because 1221753 - 2¹ = 1221751 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 (1221751) 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, 15625 + ... + 15702.

It is an arithmetic number, because the mean of its divisors is an integer number (219296).

2^1221753 is an apocalyptic number.

1221753 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1221753 is a deficient number, since it is larger than the sum of its proper divisors (532615).

1221753 is a wasteful number, since it uses less digits than its factorization.

1221753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31343.

The product of its digits is 420, while the sum is 21.

The square root of 1221753 is about 1105.3293626788. The cubic root of 1221753 is about 106.9041270087.

Adding to 1221753 its reverse (3571221), we get a palindrome (4792974).

The spelling of 1221753 in words is "one million, two hundred twenty-one thousand, seven hundred fifty-three".