209512380 has 192 divisors, whose sum is σ = 740275200. Its totient is φ = 43008000.

The previous prime is 209512379. The next prime is 209512399. The reversal of 209512380 is 83215902.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 466396 + ... + 466844.

It is an arithmetic number, because the mean of its divisors is an integer number (3855600).

Almost surely, 2^209512380 is an apocalyptic number.

209512380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209512380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (370137600).

209512380 is an abundant number, since it is smaller than the sum of its proper divisors (530762820).

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

209512380 is a wasteful number, since it uses less digits than its factorization.

209512380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 578 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 209512380 is about 14474.5424798161. The cubic root of 209512380 is about 593.9317791710.

The spelling of 209512380 in words is "two hundred nine million, five hundred twelve thousand, three hundred eighty".