1864859 has 2 divisors, whose sum is σ = 1864860. Its totient is φ = 1864858.

The previous prime is 1864853. The next prime is 1864861. The reversal of 1864859 is 9584681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1864859 - 2¹² = 1860763 is a prime.

Together with 1864861, 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 (1864853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932429 + 932430.

It is an arithmetic number, because the mean of its divisors is an integer number (932430).

2^1864859 is an apocalyptic number.

1864859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1864859 is an equidigital number, since it uses as much as digits as its factorization.

1864859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 1864859 is about 1365.5984036312. The cubic root of 1864859 is about 123.0878918810.

The spelling of 1864859 in words is "one million, eight hundred sixty-four thousand, eight hundred fifty-nine".