245208389 has 4 divisors (see below), whose sum is σ = 245282700. Its totient is φ = 245134080.

The previous prime is 245208373. The next prime is 245208407. The reversal of 245208389 is 983802542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 983802542 = 2 ⋅491901271.

It can be written as a sum of positive squares in 2 ways, for example, as 126180289 + 119028100 = 11233^2 + 10910^2 .

It is a cyclic number.

It is not a de Polignac number, because 245208389 - 2⁴ = 245208373 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 (245202389) 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, 31964 + ... + 38885.

It is an arithmetic number, because the mean of its divisors is an integer number (61320675).

Almost surely, 2^245208389 is an apocalyptic number.

It is an amenable number.

245208389 is a deficient number, since it is larger than the sum of its proper divisors (74311).

245208389 is an equidigital number, since it uses as much as digits as its factorization.

245208389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74310.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 245208389 is about 15659.1311700235. The cubic root of 245208389 is about 625.9098334955.

The spelling of 245208389 in words is "two hundred forty-five million, two hundred eight thousand, three hundred eighty-nine".