208881397 has 12 divisors (see below), whose sum is σ = 224953636. Its totient is φ = 193881600.

The previous prime is 208881371. The next prime is 208881419. The reversal of 208881397 is 793188802.

It can be written as a sum of positive squares in 6 ways, for example, as 70795396 + 138086001 = 8414^2 + 11751^2 .

It is not a de Polignac number, because 208881397 - 2¹⁹ = 208357109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208881367) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16147 + ... + 26047.

Almost surely, 2^208881397 is an apocalyptic number.

It is an amenable number.

208881397 is a deficient number, since it is larger than the sum of its proper divisors (16072239).

208881397 is an equidigital number, since it uses as much as digits as its factorization.

208881397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10008 (or 9991 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 208881397 is about 14452.7297421629. The cubic root of 208881397 is about 593.3349366268.

The spelling of 208881397 in words is "two hundred eight million, eight hundred eighty-one thousand, three hundred ninety-seven".