1923421 has 8 divisors (see below), whose sum is σ = 2021184. Its totient is φ = 1826880.

The previous prime is 1923419. The next prime is 1923437. The reversal of 1923421 is 1243291.

1923421 is nontrivially palindromic in base 4.

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 1923421 - 2¹ = 1923419 is a prime.

It is a Duffinian number.

1923421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1923392 and 1923401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1923401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5370 + ... + 5716.

It is an arithmetic number, because the mean of its divisors is an integer number (252648).

2^1923421 is an apocalyptic number.

It is an amenable number.

1923421 is a deficient number, since it is larger than the sum of its proper divisors (97763).

1923421 is a wasteful number, since it uses less digits than its factorization.

1923421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611.

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

The square root of 1923421 is about 1386.8745437133. The cubic root of 1923421 is about 124.3630747891.

The spelling of 1923421 in words is "one million, nine hundred twenty-three thousand, four hundred twenty-one".