398708045 has 4 divisors (see below), whose sum is σ = 478449660. Its totient is φ = 318966432.

The previous prime is 398708033. The next prime is 398708069. The reversal of 398708045 is 540807893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 540807893 = 17 ⋅31812229.

It can be written as a sum of positive squares in 2 ways, for example, as 62425801 + 336282244 = 7901^2 + 18338^2 .

It is a cyclic number.

It is not a de Polignac number, because 398708045 - 2¹⁰ = 398707021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 398707987 and 398708005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39870800 + ... + 39870809.

It is an arithmetic number, because the mean of its divisors is an integer number (119612415).

Almost surely, 2^398708045 is an apocalyptic number.

It is an amenable number.

398708045 is a deficient number, since it is larger than the sum of its proper divisors (79741615).

398708045 is an equidigital number, since it uses as much as digits as its factorization.

398708045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79741614.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 398708045 is about 19967.6750023632. The cubic root of 398708045 is about 736.0121769852.

The spelling of 398708045 in words is "three hundred ninety-eight million, seven hundred eight thousand, forty-five".