99919985 has 24 divisors (see below), whose sum is σ = 132464808. Its totient is φ = 72300800.

The previous prime is 99919969. The next prime is 99919997. The reversal of 99919985 is 58991999.

It can be written as a sum of positive squares in 4 ways, for example, as 379456 + 99540529 = 616^2 + 9977^2 .

It is not a de Polignac number, because 99919985 - 2⁴ = 99919969 is a prime.

It is a super-3 number, since 3×99919985³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191525 + ... + 192045.

It is an arithmetic number, because the mean of its divisors is an integer number (5519367).

Almost surely, 2^99919985 is an apocalyptic number.

It is an amenable number.

99919985 is a deficient number, since it is larger than the sum of its proper divisors (32544823).

99919985 is a wasteful number, since it uses less digits than its factorization.

99919985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865 (or 854 counting only the distinct ones).

The product of its digits is 2361960, while the sum is 59.

The square root of 99919985 is about 9995.9984493796. The cubic root of 99919985 is about 464.0350514172.

The spelling of 99919985 in words is "ninety-nine million, nine hundred nineteen thousand, nine hundred eighty-five".