99809390 has 16 divisors (see below), whose sum is σ = 181932480. Its totient is φ = 39418080.

The previous prime is 99809383. The next prime is 99809393. The reversal of 99809390 is 9390899.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99809393) 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, 62381 + ... + 63960.

It is an arithmetic number, because the mean of its divisors is an integer number (11370780).

Almost surely, 2^99809390 is an apocalyptic number.

99809390 is a deficient number, since it is larger than the sum of its proper divisors (82123090).

99809390 is a wasteful number, since it uses less digits than its factorization.

99809390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126427.

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 99809390 is about 9990.4649541450. The cubic root of 99809390 is about 463.8637847034.

The spelling of 99809390 in words is "ninety-nine million, eight hundred nine thousand, three hundred ninety".