1865957 has 2 divisors, whose sum is σ = 1865958. Its totient is φ = 1865956.

The previous prime is 1865939. The next prime is 1865959. The reversal of 1865957 is 7595681.

It is a Cunningham number, because it is equal to 1366²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1865956 + 1 = 1366^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 1865957 - 2⁶ = 1865893 is a prime.

Together with 1865959, 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 (1865959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932978 + 932979.

It is an arithmetic number, because the mean of its divisors is an integer number (932979).

2^1865957 is an apocalyptic number.

It is an amenable number.

1865957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1865957 is an equidigital number, since it uses as much as digits as its factorization.

1865957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 41.

The square root of 1865957 is about 1366.0003660322. Note that the first 3 decimals coincide. The cubic root of 1865957 is about 123.1120445540.

The spelling of 1865957 in words is "one million, eight hundred sixty-five thousand, nine hundred fifty-seven".