1221423 has 16 divisors (see below), whose sum is σ = 1900800. Its totient is φ = 697368.

The previous prime is 1221421. The next prime is 1221427. The reversal of 1221423 is 3241221.

It is not a de Polignac number, because 1221423 - 2¹ = 1221421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 436 + ... + 1622.

It is an arithmetic number, because the mean of its divisors is an integer number (118800).

2^1221423 is an apocalyptic number.

1221423 is a deficient number, since it is larger than the sum of its proper divisors (679377).

1221423 is an equidigital number, since it uses as much as digits as its factorization.

1221423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211 (or 1197 counting only the distinct ones).

The product of its digits is 96, while the sum is 15.

The square root of 1221423 is about 1105.1800758247. The cubic root of 1221423 is about 106.8945010754.

Adding to 1221423 its reverse (3241221), we get a palindrome (4462644).

The spelling of 1221423 in words is "one million, two hundred twenty-one thousand, four hundred twenty-three".