1243921 has 8 divisors (see below), whose sum is σ = 1439424. Its totient is φ = 1052880.

The previous prime is 1243889. The next prime is 1243927. The reversal of 1243921 is 1293421.

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

It is a cyclic number.

It is not a de Polignac number, because 1243921 - 2⁵ = 1243889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243892 and 1243901.

It is not an unprimeable number, because it can be changed into a prime (1243927) 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 7 ways as a sum of consecutive naturals, for example, 490 + ... + 1651.

It is an arithmetic number, because the mean of its divisors is an integer number (179928).

2^1243921 is an apocalyptic number.

It is an amenable number.

1243921 is a deficient number, since it is larger than the sum of its proper divisors (195503).

1243921 is an equidigital number, since it uses as much as digits as its factorization.

1243921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231.

The product of its digits is 432, while the sum is 22.

The square root of 1243921 is about 1115.3120639534. The cubic root of 1243921 is about 107.5468265439.

The spelling of 1243921 in words is "one million, two hundred forty-three thousand, nine hundred twenty-one".