208972739 has 4 divisors (see below), whose sum is σ = 210476280. Its totient is φ = 207469200.

The previous prime is 208972727. The next prime is 208972741. The reversal of 208972739 is 937279802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 208972739 - 2⁴ = 208972723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 208972693 and 208972702.

It is not an unprimeable number, because it can be changed into a prime (208972759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 751562 + ... + 751839.

It is an arithmetic number, because the mean of its divisors is an integer number (52619070).

Almost surely, 2^208972739 is an apocalyptic number.

208972739 is a deficient number, since it is larger than the sum of its proper divisors (1503541).

208972739 is a wasteful number, since it uses less digits than its factorization.

208972739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503540.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 208972739 is about 14455.8894226540. The cubic root of 208972739 is about 593.4214107418.

The spelling of 208972739 in words is "two hundred eight million, nine hundred seventy-two thousand, seven hundred thirty-nine".