209347938072 has 512 divisors, whose sum is σ = 749629440000. Its totient is φ = 52614904320.

The previous prime is 209347938017. The next prime is 209347938101. The reversal of 209347938072 is 270839743902.

209347938072 is a `hidden beast` number, since 2 + 0 + 93 + 479 + 3 + 80 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 149640429 + ... + 149641827.

It is an arithmetic number, because the mean of its divisors is an integer number (1464120000).

Almost surely, 2^209347938072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209347938072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (374814720000).

209347938072 is an abundant number, since it is smaller than the sum of its proper divisors (540281501928).

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

209347938072 is a wasteful number, since it uses less digits than its factorization.

209347938072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788 (or 1778 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 54.

The spelling of 209347938072 in words is "two hundred nine billion, three hundred forty-seven million, nine hundred thirty-eight thousand, seventy-two".