209997026 has 8 divisors (see below), whose sum is σ = 315196140. Its totient is φ = 104931648.

The previous prime is 209997017. The next prime is 209997041. The reversal of 209997026 is 620799902.

It can be written as a sum of positive squares in 2 ways, for example, as 207388801 + 2608225 = 14401^2 + 1615^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29411 + ... + 35846.

Almost surely, 2^209997026 is an apocalyptic number.

209997026 is a deficient number, since it is larger than the sum of its proper divisors (105199114).

209997026 is a wasteful number, since it uses less digits than its factorization.

209997026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66868.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 209997026 is about 14491.2741330775. The cubic root of 209997026 is about 594.3893893545.

The spelling of 209997026 in words is "two hundred nine million, nine hundred ninety-seven thousand, twenty-six".