208929813 has 8 divisors (see below), whose sum is σ = 294959808. Its totient is φ = 131093184.

The previous prime is 208929793. The next prime is 208929817. The reversal of 208929813 is 318929802.

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

It is not a de Polignac number, because 208929813 - 2¹³ = 208921621 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208929817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2048281 + ... + 2048382.

It is an arithmetic number, because the mean of its divisors is an integer number (36869976).

Almost surely, 2^208929813 is an apocalyptic number.

It is an amenable number.

208929813 is a deficient number, since it is larger than the sum of its proper divisors (86029995).

208929813 is a wasteful number, since it uses less digits than its factorization.

208929813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4096683.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 208929813 is about 14454.4046228131. The cubic root of 208929813 is about 593.3807755343.

The spelling of 208929813 in words is "two hundred eight million, nine hundred twenty-nine thousand, eight hundred thirteen".