805275398 has 4 divisors (see below), whose sum is σ = 1207913100. Its totient is φ = 402637698.

The previous prime is 805275391. The next prime is 805275409. The reversal of 805275398 is 893572508.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805275391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201318848 + ... + 201318851.

It is an arithmetic number, because the mean of its divisors is an integer number (301978275).

Almost surely, 2^805275398 is an apocalyptic number.

805275398 is a deficient number, since it is larger than the sum of its proper divisors (402637702).

805275398 is a wasteful number, since it uses less digits than its factorization.

805275398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402637701.

The product of its (nonzero) digits is 604800, while the sum is 47.

The square root of 805275398 is about 28377.3747552518. The cubic root of 805275398 is about 930.3538168905.

The spelling of 805275398 in words is "eight hundred five million, two hundred seventy-five thousand, three hundred ninety-eight".