209087394 has 16 divisors (see below), whose sum is σ = 420513120. Its totient is φ = 69306080.

The previous prime is 209087393. The next prime is 209087423. The reversal of 209087394 is 493780902.

It is a super-2 number, since 2×209087394² = 87435076659422472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (209087393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96267 + ... + 98414.

It is an arithmetic number, because the mean of its divisors is an integer number (26282070).

Almost surely, 2^209087394 is an apocalyptic number.

209087394 is an abundant number, since it is smaller than the sum of its proper divisors (211425726).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209087394 is a wasteful number, since it uses less digits than its factorization.

209087394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194865.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 209087394 is about 14459.8545635840. The cubic root of 209087394 is about 593.5299197792.

The spelling of 209087394 in words is "two hundred nine million, eighty-seven thousand, three hundred ninety-four".