99400890 has 16 divisors (see below), whose sum is σ = 238562208. Its totient is φ = 26506896.

The previous prime is 99400841. The next prime is 99400897. The reversal of 99400890 is 9800499.

It is not an unprimeable number, because it can be changed into a prime (99400897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1656652 + ... + 1656711.

It is an arithmetic number, because the mean of its divisors is an integer number (14910138).

Almost surely, 2^99400890 is an apocalyptic number.

99400890 is an abundant number, since it is smaller than the sum of its proper divisors (139161318).

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

99400890 is a wasteful number, since it uses less digits than its factorization.

99400890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3313373.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 99400890 is about 9969.9994984955. Note that the first 3 decimals coincide. The cubic root of 99400890 is about 463.2300852816.

The spelling of 99400890 in words is "ninety-nine million, four hundred thousand, eight hundred ninety".