209438087 has 8 divisors (see below), whose sum is σ = 217274400. Its totient is φ = 201642784.

The previous prime is 209438039. The next prime is 209438107. The reversal of 209438087 is 780834902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209438087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209438027) 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, 353 + ... + 20469.

It is an arithmetic number, because the mean of its divisors is an integer number (27159300).

Almost surely, 2^209438087 is an apocalyptic number.

209438087 is a deficient number, since it is larger than the sum of its proper divisors (7836313).

209438087 is a wasteful number, since it uses less digits than its factorization.

209438087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20505.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 209438087 is about 14471.9759189960. The cubic root of 209438087 is about 593.8615682201.

The spelling of 209438087 in words is "two hundred nine million, four hundred thirty-eight thousand, eighty-seven".