209308402086 has 64 divisors (see below), whose sum is σ = 479646655488. Its totient is φ = 59649182208.

The previous prime is 209308402033. The next prime is 209308402151. The reversal of 209308402086 is 680204803902.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29095306 + ... + 29102498.

It is an arithmetic number, because the mean of its divisors is an integer number (7494478992).

Almost surely, 2^209308402086 is an apocalyptic number.

209308402086 is an abundant number, since it is smaller than the sum of its proper divisors (270338253402).

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

209308402086 is a wasteful number, since it uses less digits than its factorization.

209308402086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8885.

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 209308402086 in words is "two hundred nine billion, three hundred eight million, four hundred two thousand, eighty-six".