998425805 has 18 divisors (see below), whose sum is σ = 1298557386. Its totient is φ = 736620768.

The previous prime is 998425787. The next prime is 998425807. The reversal of 998425805 is 508524899.

998425805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 4726276 + 993699529 = 2174^2 + 31523^2 .

It is not a de Polignac number, because 998425805 - 2¹⁶ = 998360269 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998425807) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 917972 + ... + 919058.

It is an arithmetic number, because the mean of its divisors is an integer number (72142077).

Almost surely, 2^998425805 is an apocalyptic number.

It is an amenable number.

998425805 is a deficient number, since it is larger than the sum of its proper divisors (300131581).

998425805 is an equidigital number, since it uses as much as digits as its factorization.

998425805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2205 (or 1105 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 50.

The square root of 998425805 is about 31597.8765900495. The cubic root of 998425805 is about 999.4749927490.

The spelling of 998425805 in words is "nine hundred ninety-eight million, four hundred twenty-five thousand, eight hundred five".