209996730 has 24 divisors (see below), whose sum is σ = 545991732. Its totient is φ = 55999104.

The previous prime is 209996707. The next prime is 209996741. The reversal of 209996730 is 37699902.

209996730 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 203661441 + 6335289 = 14271^2 + 2517^2 .

It is a super-2 number, since 2×209996730² = 88197253221385800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1166559 + ... + 1166738.

Almost surely, 2^209996730 is an apocalyptic number.

209996730 is an abundant number, since it is smaller than the sum of its proper divisors (335995002).

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

209996730 is a wasteful number, since it uses less digits than its factorization.

209996730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333310 (or 2333307 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 45.

The square root of 209996730 is about 14491.2639200313. The cubic root of 209996730 is about 594.3891100818.

The spelling of 209996730 in words is "two hundred nine million, nine hundred ninety-six thousand, seven hundred thirty".