1865791 has 2 divisors, whose sum is σ = 1865792. Its totient is φ = 1865790.

The previous prime is 1865729. The next prime is 1865821. The reversal of 1865791 is 1975681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1865791 - 2¹³ = 1857599 is a prime.

1865791 is a lucky number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1865791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1865711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932895 + 932896.

It is an arithmetic number, because the mean of its divisors is an integer number (932896).

2^1865791 is an apocalyptic number.

1865791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1865791 is an equidigital number, since it uses as much as digits as its factorization.

1865791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 37.

The square root of 1865791 is about 1365.9396033500. The cubic root of 1865791 is about 123.1083936651.

The spelling of 1865791 in words is "one million, eight hundred sixty-five thousand, seven hundred ninety-one".