623433409 has 2 divisors, whose sum is σ = 623433410. Its totient is φ = 623433408.

The previous prime is 623433407. The next prime is 623433449. The reversal of 623433409 is 904334326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 583705600 + 39727809 = 24160^2 + 6303^2 .

It is a cyclic number.

It is not a de Polignac number, because 623433409 - 2¹ = 623433407 is a prime.

It is a super-2 number, since 2×623433409² = 777338430914722562, which contains 22 as substring.

Together with 623433407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (623433407) 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, 311716704 + 311716705.

It is an arithmetic number, because the mean of its divisors is an integer number (311716705).

Almost surely, 2^623433409 is an apocalyptic number.

It is an amenable number.

623433409 is a deficient number, since it is larger than the sum of its proper divisors (1).

623433409 is an equidigital number, since it uses as much as digits as its factorization.

623433409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 34.

The square root of 623433409 is about 24968.6485216962. The cubic root of 623433409 is about 854.2730202034.

The spelling of 623433409 in words is "six hundred twenty-three million, four hundred thirty-three thousand, four hundred nine".