208640395 has 4 divisors (see below), whose sum is σ = 250368480. Its totient is φ = 166912312.

The previous prime is 208640381. The next prime is 208640417. The reversal of 208640395 is 593046802.

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 208640395 - 2²³ = 200251787 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20864035 + ... + 20864044.

It is an arithmetic number, because the mean of its divisors is an integer number (62592120).

Almost surely, 2^208640395 is an apocalyptic number.

208640395 is a deficient number, since it is larger than the sum of its proper divisors (41728085).

208640395 is an equidigital number, since it uses as much as digits as its factorization.

208640395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41728084.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 208640395 is about 14444.3897413494. The cubic root of 208640395 is about 593.1066572646.

The spelling of 208640395 in words is "two hundred eight million, six hundred forty thousand, three hundred ninety-five".