1835921 has 2 divisors, whose sum is σ = 1835922. Its totient is φ = 1835920.

The previous prime is 1835909. The next prime is 1835923. The reversal of 1835921 is 1295381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1809025 + 26896 = 1345^2 + 164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1835921 is a prime.

Together with 1835923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1835923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 917960 + 917961.

It is an arithmetic number, because the mean of its divisors is an integer number (917961).

2^1835921 is an apocalyptic number.

It is an amenable number.

1835921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1835921 is an equidigital number, since it uses as much as digits as its factorization.

1835921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 29.

The square root of 1835921 is about 1354.9616230728. The cubic root of 1835921 is about 122.4478967646.

The spelling of 1835921 in words is "one million, eight hundred thirty-five thousand, nine hundred twenty-one".