209137072 has 20 divisors (see below), whose sum is σ = 406949400. Its totient is φ = 104117888.

The previous prime is 209137021. The next prime is 209137073. The reversal of 209137072 is 270731902.

It is not an unprimeable number, because it can be changed into a prime (209137073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24322 + ... + 31777.

It is an arithmetic number, because the mean of its divisors is an integer number (20347470).

Almost surely, 2^209137072 is an apocalyptic number.

It is an amenable number.

209137072 is a deficient number, since it is larger than the sum of its proper divisors (197812328).

209137072 is a wasteful number, since it uses less digits than its factorization.

209137072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56340 (or 56334 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 209137072 is about 14461.5722520063. The cubic root of 209137072 is about 593.5769225244.

Adding to 209137072 its reverse (270731902), we get a palindrome (479868974).

The spelling of 209137072 in words is "two hundred nine million, one hundred thirty-seven thousand, seventy-two".