209864343376 has 40 divisors (see below), whose sum is σ = 414410518440. Its totient is φ = 102920902656.

The previous prime is 209864343373. The next prime is 209864343379. The reversal of 209864343376 is 673343468902.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (209864343373) and next prime (209864343379).

It can be written as a sum of positive squares in 4 ways, for example, as 59475503376 + 150388840000 = 243876^2 + 387800^2 .

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209864343373) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2875140 + ... + 2947228.

It is an arithmetic number, because the mean of its divisors is an integer number (10360262961).

Almost surely, 2^209864343376 is an apocalyptic number.

It is an amenable number.

209864343376 is a deficient number, since it is larger than the sum of its proper divisors (204546175064).

209864343376 is a wasteful number, since it uses less digits than its factorization.

209864343376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75583 (or 75577 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 55.

The spelling of 209864343376 in words is "two hundred nine billion, eight hundred sixty-four million, three hundred forty-three thousand, three hundred seventy-six".