209734039 has 4 divisors (see below), whose sum is σ = 211141800. Its totient is φ = 208326280.

The previous prime is 209734009. The next prime is 209734051. The reversal of 209734039 is 930437902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 930437902 = 2 ⋅465218951.

It is a cyclic number.

It is not a de Polignac number, because 209734039 - 2¹³ = 209725847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 209733989 and 209734007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209734009) 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 3 ways as a sum of consecutive naturals, for example, 703657 + ... + 703954.

It is an arithmetic number, because the mean of its divisors is an integer number (52785450).

Almost surely, 2^209734039 is an apocalyptic number.

209734039 is a deficient number, since it is larger than the sum of its proper divisors (1407761).

209734039 is a wasteful number, since it uses less digits than its factorization.

209734039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407760.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 209734039 is about 14482.1973125628. The cubic root of 209734039 is about 594.1411604717.

The spelling of 209734039 in words is "two hundred nine million, seven hundred thirty-four thousand, thirty-nine".