209317380 has 48 divisors (see below), whose sum is σ = 594847680. Its totient is φ = 54983808.

The previous prime is 209317369. The next prime is 209317391. The reversal of 209317380 is 83713902.

209317380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (209317369) and next prime (209317391).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22015 + ... + 30054.

It is an arithmetic number, because the mean of its divisors is an integer number (12392660).

Almost surely, 2^209317380 is an apocalyptic number.

209317380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209317380 is an abundant number, since it is smaller than the sum of its proper divisors (385530300).

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

209317380 is a wasteful number, since it uses less digits than its factorization.

209317380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52148 (or 52146 counting only the distinct ones).

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

The square root of 209317380 is about 14467.8049475378. The cubic root of 209317380 is about 593.7474580870.

The spelling of 209317380 in words is "two hundred nine million, three hundred seventeen thousand, three hundred eighty".