209550438 has 24 divisors (see below), whose sum is σ = 464586408. Its totient is φ = 68225472.

The previous prime is 209550437. The next prime is 209550443. The reversal of 209550438 is 834055902.

It is a super-2 number, since 2×209550438² = 87822772131983688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209550437) 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 11 ways as a sum of consecutive naturals, for example, 134595 + ... + 136142.

It is an arithmetic number, because the mean of its divisors is an integer number (19357767).

Almost surely, 2^209550438 is an apocalyptic number.

209550438 is an abundant number, since it is smaller than the sum of its proper divisors (255035970).

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

209550438 is a wasteful number, since it uses less digits than its factorization.

209550438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270788 (or 270785 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 209550438 is about 14475.8570730717. The cubic root of 209550438 is about 593.9677396349.

The spelling of 209550438 in words is "two hundred nine million, five hundred fifty thousand, four hundred thirty-eight".