809639098 has 4 divisors (see below), whose sum is σ = 1214458650. Its totient is φ = 404819548.

The previous prime is 809639063. The next prime is 809639099. The reversal of 809639098 is 890936908.

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

It can be written as a sum of positive squares in only one way, i.e., 779135569 + 30503529 = 27913^2 + 5523^2 .

It is not an unprimeable number, because it can be changed into a prime (809639099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202409773 + ... + 202409776.

Almost surely, 2^809639098 is an apocalyptic number.

809639098 is a deficient number, since it is larger than the sum of its proper divisors (404819552).

809639098 is a wasteful number, since it uses less digits than its factorization.

809639098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404819551.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 809639098 is about 28454.1578332587. The cubic root of 809639098 is about 932.0312859815.

The spelling of 809639098 in words is "eight hundred nine million, six hundred thirty-nine thousand, ninety-eight".