209054923 has 12 divisors (see below), whose sum is σ = 265294872. Its totient is φ = 162899520.

The previous prime is 209054893. The next prime is 209054927. The reversal of 209054923 is 329450902.

It is a de Polignac number, because none of the positive numbers 2^k-209054923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209054927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 193390 + ... + 194467.

It is an arithmetic number, because the mean of its divisors is an integer number (22107906).

Almost surely, 2^209054923 is an apocalyptic number.

209054923 is a deficient number, since it is larger than the sum of its proper divisors (56239949).

209054923 is a wasteful number, since it uses less digits than its factorization.

209054923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387882 (or 387875 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 209054923 is about 14458.7317216968. The cubic root of 209054923 is about 593.4991933807.

The spelling of 209054923 in words is "two hundred nine million, fifty-four thousand, nine hundred twenty-three".