1098839805 has 32 divisors (see below), whose sum is σ = 2010872064. Its totient is φ = 501935616.

The previous prime is 1098839773. The next prime is 1098839821. The reversal of 1098839805 is 5089388901.

It is not a de Polignac number, because 1098839805 - 2⁵ = 1098839773 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164409 + ... + 170961.

It is an arithmetic number, because the mean of its divisors is an integer number (62839752).

Almost surely, 2^1098839805 is an apocalyptic number.

1098839805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1098839805 is a deficient number, since it is larger than the sum of its proper divisors (912032259).

1098839805 is a wasteful number, since it uses less digits than its factorization.

1098839805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8165.

The product of its (nonzero) digits is 622080, while the sum is 51.

The square root of 1098839805 is about 33148.7526914664. The cubic root of 1098839805 is about 1031.9170646876.

The spelling of 1098839805 in words is "one billion, ninety-eight million, eight hundred thirty-nine thousand, eight hundred five".