1853121 has 4 divisors (see below), whose sum is σ = 2470832. Its totient is φ = 1235412.

The previous prime is 1853107. The next prime is 1853161. The reversal of 1853121 is 1213581.

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: 1213581 = 3 ⋅404527.

It is not a de Polignac number, because 1853121 - 2¹⁵ = 1820353 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1853161) 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, 308851 + ... + 308856.

It is an arithmetic number, because the mean of its divisors is an integer number (617708).

2^1853121 is an apocalyptic number.

It is an amenable number.

1853121 is a deficient number, since it is larger than the sum of its proper divisors (617711).

1853121 is an equidigital number, since it uses as much as digits as its factorization.

1853121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617710.

The product of its digits is 240, while the sum is 21.

The square root of 1853121 is about 1361.2938698165. The cubic root of 1853121 is about 122.8290970389.

The spelling of 1853121 in words is "one million, eight hundred fifty-three thousand, one hundred twenty-one".