208816947 has 30 divisors (see below), whose sum is σ = 316290612. Its totient is φ = 137859732.

The previous prime is 208816943. The next prime is 208816981. The reversal of 208816947 is 749618802.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

208816947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 208816947 - 2² = 208816943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (208816943) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 2027298 + ... + 2027400.

Almost surely, 2^208816947 is an apocalyptic number.

208816947 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

208816947 is a deficient number, since it is larger than the sum of its proper divisors (107473665).

208816947 is an frugal number, since it uses more digits than its factorization.

208816947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 208816947 is about 14450.4998875471. The cubic root of 208816947 is about 593.2739061874.

The spelling of 208816947 in words is "two hundred eight million, eight hundred sixteen thousand, nine hundred forty-seven".