209726380972 has 12 divisors (see below), whose sum is σ = 367054164400. Its totient is φ = 104853762576.

The previous prime is 209726380967. The next prime is 209726380987. The reversal of 209726380972 is 279083627902.

209726380972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×209726380972² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2306808 + ... + 2395999.

Almost surely, 2^209726380972 is an apocalyptic number.

It is an amenable number.

209726380972 is a deficient number, since it is larger than the sum of its proper divisors (157327783428).

209726380972 is a wasteful number, since it uses less digits than its factorization.

209726380972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4713960 (or 4713958 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 55.

The spelling of 209726380972 in words is "two hundred nine billion, seven hundred twenty-six million, three hundred eighty thousand, nine hundred seventy-two".