1855949 has 2 divisors, whose sum is σ = 1855950. Its totient is φ = 1855948.

The previous prime is 1855933. The next prime is 1855951. The reversal of 1855949 is 9495581.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1612900 + 243049 = 1270^2 + 493^2 .

It is a cyclic number.

It is not a de Polignac number, because 1855949 - 2⁴ = 1855933 is a prime.

Together with 1855951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1855969) 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, 927974 + 927975.

It is an arithmetic number, because the mean of its divisors is an integer number (927975).

2^1855949 is an apocalyptic number.

It is an amenable number.

1855949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855949 is an equidigital number, since it uses as much as digits as its factorization.

1855949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 41.

The square root of 1855949 is about 1362.3321915010. The cubic root of 1855949 is about 122.8915473838.

The spelling of 1855949 in words is "one million, eight hundred fifty-five thousand, nine hundred forty-nine".