1323921 has 4 divisors (see below), whose sum is σ = 1765232. Its totient is φ = 882612.

The previous prime is 1323919. The next prime is 1323923. The reversal of 1323921 is 1293231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1293231 = 3 ⋅431077.

It is an interprime number because it is at equal distance from previous prime (1323919) and next prime (1323923).

It is not a de Polignac number, because 1323921 - 2¹ = 1323919 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1323923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220651 + ... + 220656.

It is an arithmetic number, because the mean of its divisors is an integer number (441308).

2^1323921 is an apocalyptic number.

It is an amenable number.

1323921 is a deficient number, since it is larger than the sum of its proper divisors (441311).

1323921 is an equidigital number, since it uses as much as digits as its factorization.

1323921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441310.

The product of its digits is 324, while the sum is 21.

The square root of 1323921 is about 1150.6176602156. The cubic root of 1323921 is about 109.8046394701.

The spelling of 1323921 in words is "one million, three hundred twenty-three thousand, nine hundred twenty-one".