1320623 has 2 divisors, whose sum is σ = 1320624. Its totient is φ = 1320622.

The previous prime is 1320617. The next prime is 1320667. The reversal of 1320623 is 3260231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1320623 - 2⁴ = 1320607 is a prime.

It is equal to p₁₀₁₄₇₄ and since 1320623 and 101474 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320023) 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, 660311 + 660312.

It is an arithmetic number, because the mean of its divisors is an integer number (660312).

2^1320623 is an apocalyptic number.

1320623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320623 is an equidigital number, since it uses as much as digits as its factorization.

1320623 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 17.

The square root of 1320623 is about 1149.1836232735. The cubic root of 1320623 is about 109.7133860842.

Adding to 1320623 its reverse (3260231), we get a palindrome (4580854).

The spelling of 1320623 in words is "one million, three hundred twenty thousand, six hundred twenty-three".