99840256 has 18 divisors (see below), whose sum is σ = 199291022. Its totient is φ = 49920000.

The previous prime is 99840229. The next prime is 99840259. The reversal of 99840256 is 65204899.

It can be written as a sum of positive squares in only one way, i.e., 99680256 + 160000 = 9984^2 + 400^2 .

It is not an unprimeable number, because it can be changed into a prime (99840259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194745 + ... + 195256.

Almost surely, 2^99840256 is an apocalyptic number.

It is an amenable number.

99840256 is a deficient number, since it is larger than the sum of its proper divisors (99450766).

99840256 is an equidigital number, since it uses as much as digits as its factorization.

99840256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390017 (or 390003 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 99840256 is about 9992.0096076815. The cubic root of 99840256 is about 463.9115963169.

The spelling of 99840256 in words is "ninety-nine million, eight hundred forty thousand, two hundred fifty-six".