209798734 has 16 divisors (see below), whose sum is σ = 334298016. Its totient is φ = 98406400.

The previous prime is 209798653. The next prime is 209798737. The reversal of 209798734 is 437897902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209798737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 654 + ... + 20494.

It is an arithmetic number, because the mean of its divisors is an integer number (20893626).

Almost surely, 2^209798734 is an apocalyptic number.

209798734 is a deficient number, since it is larger than the sum of its proper divisors (124499282).

209798734 is a wasteful number, since it uses less digits than its factorization.

209798734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20171.

The product of its (nonzero) digits is 762048, while the sum is 49.

The square root of 209798734 is about 14484.4307447687. The cubic root of 209798734 is about 594.2022441995.

The spelling of 209798734 in words is "two hundred nine million, seven hundred ninety-eight thousand, seven hundred thirty-four".