209820734 has 8 divisors (see below), whose sum is σ = 314886528. Its totient is φ = 104858560.

The previous prime is 209820701. The next prime is 209820769. The reversal of 209820734 is 437028902.

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

It is a junction number, because it is equal to n+sod(n) for n = 209820694 and 209820703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20627 + ... + 29070.

It is an arithmetic number, because the mean of its divisors is an integer number (39360816).

Almost surely, 2^209820734 is an apocalyptic number.

209820734 is a deficient number, since it is larger than the sum of its proper divisors (105065794).

209820734 is a wasteful number, since it uses less digits than its factorization.

209820734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51810.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 209820734 is about 14485.1901609886. The cubic root of 209820734 is about 594.2230132992.

The spelling of 209820734 in words is "two hundred nine million, eight hundred twenty thousand, seven hundred thirty-four".