208868431 has 4 divisors (see below), whose sum is σ = 208901952. Its totient is φ = 208834912.

The previous prime is 208868417. The next prime is 208868459. The reversal of 208868431 is 134868802.

208868431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 208868431 - 2⁵ = 208868399 is a prime.

It is a super-2 number, since 2×208868431² = 87252042936803522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208868461) 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, 4351 + ... + 20896.

It is an arithmetic number, because the mean of its divisors is an integer number (52225488).

Almost surely, 2^208868431 is an apocalyptic number.

208868431 is a deficient number, since it is larger than the sum of its proper divisors (33521).

208868431 is an equidigital number, since it uses as much as digits as its factorization.

208868431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33520.

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 208868431 is about 14452.2811694210. The cubic root of 208868431 is about 593.3226595802.

The spelling of 208868431 in words is "two hundred eight million, eight hundred sixty-eight thousand, four hundred thirty-one".