1836121 has 4 divisors (see below), whose sum is σ = 2098432. Its totient is φ = 1573812.

The previous prime is 1836091. The next prime is 1836151. The reversal of 1836121 is 1216381.

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: 1216381 = 257 ⋅4733.

It is an interprime number because it is at equal distance from previous prime (1836091) and next prime (1836151).

It is a cyclic number.

It is not a de Polignac number, because 1836121 - 2⁷ = 1835993 is a prime.

It is an alternating number because its digits alternate between odd and even.

1836121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1836092 and 1836101.

It is not an unprimeable number, because it can be changed into a prime (1836151) 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, 131145 + ... + 131158.

It is an arithmetic number, because the mean of its divisors is an integer number (524608).

2^1836121 is an apocalyptic number.

It is an amenable number.

1836121 is a deficient number, since it is larger than the sum of its proper divisors (262311).

1836121 is an equidigital number, since it uses as much as digits as its factorization.

1836121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262310.

The product of its digits is 288, while the sum is 22.

The square root of 1836121 is about 1355.0354238912. The cubic root of 1836121 is about 122.4523429781.

The spelling of 1836121 in words is "one million, eight hundred thirty-six thousand, one hundred twenty-one".