209893638226 has 8 divisors (see below), whose sum is σ = 314879870844. Its totient is φ = 104933681280.

The previous prime is 209893638197. The next prime is 209893638233. The reversal of 209893638226 is 622836398902.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 208848086001 + 1045552225 = 456999^2 + 32335^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6548935 + ... + 6580906.

Almost surely, 2^209893638226 is an apocalyptic number.

209893638226 is a deficient number, since it is larger than the sum of its proper divisors (104986232618).

209893638226 is a wasteful number, since it uses less digits than its factorization.

209893638226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13137836.

The product of its (nonzero) digits is 13436928, while the sum is 58.

The spelling of 209893638226 in words is "two hundred nine billion, eight hundred ninety-three million, six hundred thirty-eight thousand, two hundred twenty-six".