398823445 has 4 divisors (see below), whose sum is σ = 478588140. Its totient is φ = 319058752.

The previous prime is 398823437. The next prime is 398823449. The reversal of 398823445 is 544328893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544328893 = 3307 ⋅164599.

It can be written as a sum of positive squares in 2 ways, for example, as 155525841 + 243297604 = 12471^2 + 15598^2 .

It is a cyclic number.

It is not a de Polignac number, because 398823445 - 2³ = 398823437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 398823395 and 398823404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398823449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39882340 + ... + 39882349.

It is an arithmetic number, because the mean of its divisors is an integer number (119647035).

Almost surely, 2^398823445 is an apocalyptic number.

It is an amenable number.

398823445 is a deficient number, since it is larger than the sum of its proper divisors (79764695).

398823445 is an equidigital number, since it uses as much as digits as its factorization.

398823445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79764694.

The product of its digits is 829440, while the sum is 46.

The square root of 398823445 is about 19970.5644637301. The cubic root of 398823445 is about 736.0831793249.

The spelling of 398823445 in words is "three hundred ninety-eight million, eight hundred twenty-three thousand, four hundred forty-five".