208238431 has 4 divisors (see below), whose sum is σ = 212167512. Its totient is φ = 204309352.

The previous prime is 208238419. The next prime is 208238441. The reversal of 208238431 is 134832802.

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 208238431 - 2⁵ = 208238399 is a prime.

It is a super-2 number, since 2×208238431² = 86726488290683522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 208238393 and 208238402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208238441) 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, 1964461 + ... + 1964566.

It is an arithmetic number, because the mean of its divisors is an integer number (53041878).

Almost surely, 2^208238431 is an apocalyptic number.

208238431 is a deficient number, since it is larger than the sum of its proper divisors (3929081).

208238431 is an equidigital number, since it uses as much as digits as its factorization.

208238431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3929080.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 208238431 is about 14430.4688420023. The cubic root of 208238431 is about 592.7255217502.

The spelling of 208238431 in words is "two hundred eight million, two hundred thirty-eight thousand, four hundred thirty-one".