209798026 has 8 divisors (see below), whose sum is σ = 315425124. Its totient is φ = 104656320.

The previous prime is 209798023. The next prime is 209798027. The reversal of 209798026 is 620897902.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 166435801 + 43362225 = 12901^2 + 6585^2 .

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

It is not an unprimeable number, because it can be changed into a prime (209798023) 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, 120265 + ... + 121996.

Almost surely, 2^209798026 is an apocalyptic number.

209798026 is a deficient number, since it is larger than the sum of its proper divisors (105627098).

209798026 is a wasteful number, since it uses less digits than its factorization.

209798026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242696.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 209798026 is about 14484.4063047127. The cubic root of 209798026 is about 594.2015757880.

The spelling of 209798026 in words is "two hundred nine million, seven hundred ninety-eight thousand, twenty-six".