2909623 has 2 divisors, whose sum is σ = 2909624. Its totient is φ = 2909622.

The previous prime is 2909617. The next prime is 2909633. The reversal of 2909623 is 3269092.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2909623 - 2⁵ = 2909591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2909633) 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, 1454811 + 1454812.

It is an arithmetic number, because the mean of its divisors is an integer number (1454812).

2^2909623 is an apocalyptic number.

2909623 is a deficient number, since it is larger than the sum of its proper divisors (1).

2909623 is an equidigital number, since it uses as much as digits as its factorization.

2909623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 2909623 is about 1705.7617066871. The cubic root of 2909623 is about 142.7618740525.

The spelling of 2909623 in words is "two million, nine hundred nine thousand, six hundred twenty-three".