398806745 has 4 divisors (see below), whose sum is σ = 478568100. Its totient is φ = 319045392.

The previous prime is 398806711. The next prime is 398806769. The reversal of 398806745 is 547608893.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 230948809 + 167857936 = 15197^2 + 12956^2 .

It is a cyclic number.

It is not a de Polignac number, because 398806745 - 2⁸ = 398806489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 398806693 and 398806702.

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, 39880670 + ... + 39880679.

It is an arithmetic number, because the mean of its divisors is an integer number (119642025).

Almost surely, 2^398806745 is an apocalyptic number.

It is an amenable number.

398806745 is a deficient number, since it is larger than the sum of its proper divisors (79761355).

398806745 is an equidigital number, since it uses as much as digits as its factorization.

398806745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79761354.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The square root of 398806745 is about 19970.1463439806. The cubic root of 398806745 is about 736.0729051373.

The spelling of 398806745 in words is "three hundred ninety-eight million, eight hundred six thousand, seven hundred forty-five".