1023905 has 4 divisors (see below), whose sum is σ = 1228692. Its totient is φ = 819120.

The previous prime is 1023871. The next prime is 1023941. The reversal of 1023905 is 5093201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 516961 + 506944 = 719^2 + 712^2 .

It is not a de Polignac number, because 1023905 - 2¹⁰ = 1022881 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 102386 + ... + 102395.

It is an arithmetic number, because the mean of its divisors is an integer number (307173).

2^1023905 is an apocalyptic number.

It is an amenable number.

1023905 is a deficient number, since it is larger than the sum of its proper divisors (204787).

1023905 is an equidigital number, since it uses as much as digits as its factorization.

1023905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204786.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 1023905 is about 1011.8819101061. The cubic root of 1023905 is about 100.7905669030.

The spelling of 1023905 in words is "one million, twenty-three thousand, nine hundred five".