1623859 has 2 divisors, whose sum is σ = 1623860. Its totient is φ = 1623858.

The previous prime is 1623847. The next prime is 1623863. The reversal of 1623859 is 9583261.

It is a strong prime.

It is an emirp because it is prime and its reverse (9583261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1623859 - 2⁵ = 1623827 is a prime.

1623859 is a lucky number.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (1623829) 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, 811929 + 811930.

It is an arithmetic number, because the mean of its divisors is an integer number (811930).

2^1623859 is an apocalyptic number.

1623859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623859 is an equidigital number, since it uses as much as digits as its factorization.

1623859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 34.

The square root of 1623859 is about 1274.3072627903. The cubic root of 1623859 is about 117.5392112983.

The spelling of 1623859 in words is "one million, six hundred twenty-three thousand, eight hundred fifty-nine".