209693138 has 8 divisors (see below), whose sum is σ = 314664588. Its totient is φ = 104804944.

The previous prime is 209693123. The next prime is 209693153. The reversal of 209693138 is 831396902.

It is an interprime number because it is at equal distance from previous prime (209693123) and next prime (209693153).

It can be written as a sum of positive squares in 2 ways, for example, as 174847729 + 34845409 = 13223^2 + 5903^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 209693095 and 209693104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14081 + ... + 24852.

Almost surely, 2^209693138 is an apocalyptic number.

209693138 is a deficient number, since it is larger than the sum of its proper divisors (104971450).

209693138 is a wasteful number, since it uses less digits than its factorization.

209693138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41628.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 209693138 is about 14480.7851306481. The cubic root of 209693138 is about 594.1025360825.

The spelling of 209693138 in words is "two hundred nine million, six hundred ninety-three thousand, one hundred thirty-eight".