1855123 has 2 divisors, whose sum is σ = 1855124. Its totient is φ = 1855122.

The previous prime is 1855109. The next prime is 1855153. The reversal of 1855123 is 3215581.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1855123 is a prime.

It is not a weakly prime, because it can be changed into another prime (1855153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 927561 + 927562.

It is an arithmetic number, because the mean of its divisors is an integer number (927562).

2^1855123 is an apocalyptic number.

1855123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855123 is an equidigital number, since it uses as much as digits as its factorization.

1855123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200, while the sum is 25.

The square root of 1855123 is about 1362.0290011597. The cubic root of 1855123 is about 122.8733134990.

The spelling of 1855123 in words is "one million, eight hundred fifty-five thousand, one hundred twenty-three".