209338380 has 36 divisors (see below), whose sum is σ = 634993632. Its totient is φ = 55823520.

The previous prime is 209338369. The next prime is 209338399. The reversal of 209338380 is 83833902.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 581316 + ... + 581675.

It is an arithmetic number, because the mean of its divisors is an integer number (17638712).

Almost surely, 2^209338380 is an apocalyptic number.

209338380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209338380 is an abundant number, since it is smaller than the sum of its proper divisors (425655252).

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

209338380 is a wasteful number, since it uses less digits than its factorization.

209338380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163006 (or 1163001 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 209338380 is about 14468.5306786833. The cubic root of 209338380 is about 593.7673135487.

The spelling of 209338380 in words is "two hundred nine million, three hundred thirty-eight thousand, three hundred eighty".