921443 has 4 divisors (see below), whose sum is σ = 969960. Its totient is φ = 872928.

The previous prime is 921409. The next prime is 921457. The reversal of 921443 is 344129.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 921443 - 2⁶ = 921379 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921463) 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 3 ways as a sum of consecutive naturals, for example, 24230 + ... + 24267.

It is an arithmetic number, because the mean of its divisors is an integer number (242490).

2⁹²¹⁴⁴³ is an apocalyptic number.

921443 is a deficient number, since it is larger than the sum of its proper divisors (48517).

921443 is a wasteful number, since it uses less digits than its factorization.

921443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48516.

The product of its digits is 864, while the sum is 23.

The square root of 921443 is about 959.9182256838. The cubic root of 921443 is about 97.3097055406.

The spelling of 921443 in words is "nine hundred twenty-one thousand, four hundred forty-three".