1023409 has 2 divisors, whose sum is σ = 1023410. Its totient is φ = 1023408.

The previous prime is 1023391. The next prime is 1023413. The reversal of 1023409 is 9043201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1000000 + 23409 = 1000^2 + 153^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1023409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1023419) 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, 511704 + 511705.

It is an arithmetic number, because the mean of its divisors is an integer number (511705).

2^1023409 is an apocalyptic number.

It is an amenable number.

1023409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023409 is an equidigital number, since it uses as much as digits as its factorization.

1023409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1023409 is about 1011.6367925298. The cubic root of 1023409 is about 100.7742892875.

The spelling of 1023409 in words is "one million, twenty-three thousand, four hundred nine".