1098721896 has 32 divisors (see below), whose sum is σ = 2810686560. Its totient is φ = 357723072.

The previous prime is 1098721889. The next prime is 1098721913. The reversal of 1098721896 is 6981278901.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 531295 + ... + 533358.

It is an arithmetic number, because the mean of its divisors is an integer number (87833955).

Almost surely, 2^1098721896 is an apocalyptic number.

It is an amenable number.

1098721896 is an abundant number, since it is smaller than the sum of its proper divisors (1711964664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1098721896 is a wasteful number, since it uses less digits than its factorization.

1098721896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064705 (or 1064701 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 51.

The square root of 1098721896 is about 33146.9741605474. The cubic root of 1098721896 is about 1031.8801540415.

The spelling of 1098721896 in words is "one billion, ninety-eight million, seven hundred twenty-one thousand, eight hundred ninety-six".