2009738923 has 2 divisors, whose sum is σ = 2009738924. Its totient is φ = 2009738922.

The previous prime is 2009738921. The next prime is 2009738971. The reversal of 2009738923 is 3298379002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2009738923 - 2¹ = 2009738921 is a prime.

Together with 2009738921, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2009738923.

It is not a weakly prime, because it can be changed into another prime (2009738921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004869461 + 1004869462.

It is an arithmetic number, because the mean of its divisors is an integer number (1004869462).

Almost surely, 2^2009738923 is an apocalyptic number.

2009738923 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009738923 is an equidigital number, since it uses as much as digits as its factorization.

2009738923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 2009738923 is about 44830.1117888412. Note that the first 3 decimals coincide. The cubic root of 2009738923 is about 1261.9627851038.

The spelling of 2009738923 in words is "two billion, nine million, seven hundred thirty-eight thousand, nine hundred twenty-three".