209915437982 has 8 divisors (see below), whose sum is σ = 316285144896. Its totient is φ = 104487056352.

The previous prime is 209915437951. The next prime is 209915438021. The reversal of 209915437982 is 289734519902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×209915437982² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235330763 + ... + 235331654.

It is an arithmetic number, because the mean of its divisors is an integer number (39535643112).

Almost surely, 2^209915437982 is an apocalyptic number.

209915437982 is a deficient number, since it is larger than the sum of its proper divisors (106369706914).

209915437982 is a wasteful number, since it uses less digits than its factorization.

209915437982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470662642.

The product of its (nonzero) digits is 9797760, while the sum is 59.

The spelling of 209915437982 in words is "two hundred nine billion, nine hundred fifteen million, four hundred thirty-seven thousand, nine hundred eighty-two".