209696019 has 16 divisors (see below), whose sum is σ = 301459872. Its totient is φ = 128890368.

The previous prime is 209695961. The next prime is 209696029. The reversal of 209696019 is 910696902.

It is a happy number.

It is not a de Polignac number, because 209696019 - 2¹⁷ = 209564947 is a prime.

It is a super-2 number, since 2×209696019² = 87944840768896722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (209696029) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 36187 + ... + 41579.

It is an arithmetic number, because the mean of its divisors is an integer number (18841242).

Almost surely, 2^209696019 is an apocalyptic number.

209696019 is a deficient number, since it is larger than the sum of its proper divisors (91763853).

209696019 is a wasteful number, since it uses less digits than its factorization.

209696019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6406.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 209696019 is about 14480.8846069569. The cubic root of 209696019 is about 594.1052568861.

The spelling of 209696019 in words is "two hundred nine million, six hundred ninety-six thousand, nineteen".