1923121 has 4 divisors (see below), whose sum is σ = 1926144. Its totient is φ = 1920100.

The previous prime is 1923109. The next prime is 1923127. The reversal of 1923121 is 1213291.

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: 1213291 = 389 ⋅3119.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1923121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1923127) 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, 145 + ... + 1966.

It is an arithmetic number, because the mean of its divisors is an integer number (481536).

2^1923121 is an apocalyptic number.

It is an amenable number.

1923121 is a deficient number, since it is larger than the sum of its proper divisors (3023).

1923121 is an equidigital number, since it uses as much as digits as its factorization.

1923121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3022.

The product of its digits is 108, while the sum is 19.

The square root of 1923121 is about 1386.7663826326. The cubic root of 1923121 is about 124.3566087298.

The spelling of 1923121 in words is "one million, nine hundred twenty-three thousand, one hundred twenty-one".