1921423 has 4 divisors (see below), whose sum is σ = 2195920. Its totient is φ = 1646928.

The previous prime is 1921417. The next prime is 1921427. The reversal of 1921423 is 3241291.

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 1921423 - 2⁹ = 1920911 is a prime.

It is a Duffinian number.

1921423 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1921394 and 1921403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921427) 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, 137238 + ... + 137251.

It is an arithmetic number, because the mean of its divisors is an integer number (548980).

2^1921423 is an apocalyptic number.

1921423 is a deficient number, since it is larger than the sum of its proper divisors (274497).

1921423 is an equidigital number, since it uses as much as digits as its factorization.

1921423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274496.

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

The square root of 1921423 is about 1386.1540318449. The cubic root of 1921423 is about 124.3199981545.

The spelling of 1921423 in words is "one million, nine hundred twenty-one thousand, four hundred twenty-three".