209090393 has 4 divisors (see below), whose sum is σ = 209122740. Its totient is φ = 209058048.

The previous prime is 209090389. The next prime is 209090411. The reversal of 209090393 is 393090902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 393090902 = 2 ⋅196545451.

It can be written as a sum of positive squares in 2 ways, for example, as 39778249 + 169312144 = 6307^2 + 13012^2 .

It is a cyclic number.

It is not a de Polignac number, because 209090393 - 2² = 209090389 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209090093) 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 3 ways as a sum of consecutive naturals, for example, 2780 + ... + 20637.

It is an arithmetic number, because the mean of its divisors is an integer number (52280685).

Almost surely, 2^209090393 is an apocalyptic number.

It is an amenable number.

209090393 is a deficient number, since it is larger than the sum of its proper divisors (32347).

209090393 is an equidigital number, since it uses as much as digits as its factorization.

209090393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32346.

The product of its (nonzero) digits is 13122, while the sum is 35.

The square root of 209090393 is about 14459.9582641168. The cubic root of 209090393 is about 593.5327574885.

The spelling of 209090393 in words is "two hundred nine million, ninety thousand, three hundred ninety-three".