209069690 has 8 divisors (see below), whose sum is σ = 376325460. Its totient is φ = 83627872.

The previous prime is 209069659. The next prime is 209069699. The reversal of 209069690 is 96960902.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 194909521 + 14160169 = 13961^2 + 3763^2 .

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

It is a super-2 number, since 2×209069690² = 87420270553392200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (209069699) 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, 10453475 + ... + 10453494.

Almost surely, 2^209069690 is an apocalyptic number.

209069690 is a deficient number, since it is larger than the sum of its proper divisors (167255770).

209069690 is a wasteful number, since it uses less digits than its factorization.

209069690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20906976.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 209069690 is about 14459.2423729599. The cubic root of 209069690 is about 593.5131673740.

The spelling of 209069690 in words is "two hundred nine million, sixty-nine thousand, six hundred ninety".