209138370 has 48 divisors (see below), whose sum is σ = 583884288. Its totient is φ = 47802720.

The previous prime is 209138351. The next prime is 209138387. The reversal of 209138370 is 73831902.

209138370 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69666 + ... + 72605.

It is an arithmetic number, because the mean of its divisors is an integer number (12164256).

Almost surely, 2^209138370 is an apocalyptic number.

209138370 is an abundant number, since it is smaller than the sum of its proper divisors (374745918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209138370 is a wasteful number, since it uses less digits than its factorization.

209138370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142295 (or 142288 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 209138370 is about 14461.6171294914. The cubic root of 209138370 is about 593.5781505248.

The spelling of 209138370 in words is "two hundred nine million, one hundred thirty-eight thousand, three hundred seventy".