209423798 has 4 divisors (see below), whose sum is σ = 314135700. Its totient is φ = 104711898.

The previous prime is 209423783. The next prime is 209423887. The reversal of 209423798 is 897324902.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 52355948 + ... + 52355951.

It is an arithmetic number, because the mean of its divisors is an integer number (78533925).

Almost surely, 2^209423798 is an apocalyptic number.

209423798 is a deficient number, since it is larger than the sum of its proper divisors (104711902).

209423798 is a wasteful number, since it uses less digits than its factorization.

209423798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104711901.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 209423798 is about 14471.4822323078. The cubic root of 209423798 is about 593.8480624294.

The spelling of 209423798 in words is "two hundred nine million, four hundred twenty-three thousand, seven hundred ninety-eight".