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99870005 = 519974001
BaseRepresentation
bin1011111001111…
…10010100110101
320221220220220002
411330332110311
5201031320010
613524321045
72321611124
oct574762465
9227826802
1099870005
11514128a4
1229543185
13178c95a1
14d399abb
158b7b1a5
hex5f3e535

99870005 has 4 divisors (see below), whose sum is σ = 119844012. Its totient is φ = 79896000.

The previous prime is 99869989. The next prime is 99870011. The reversal of 99870005 is 50007899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50007899 = 173289063.

It can be written as a sum of positive squares in 2 ways, for example, as 30547729 + 69322276 = 5527^2 + 8326^2 .

It is not a de Polignac number, because 99870005 - 24 = 99869989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 9986996 + ... + 9987005.

It is an arithmetic number, because the mean of its divisors is an integer number (29961003).

Almost surely, 299870005 is an apocalyptic number.

It is an amenable number.

99870005 is a deficient number, since it is larger than the sum of its proper divisors (19974007).

99870005 is a wasteful number, since it uses less digits than its factorization.

99870005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19974006.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 99870005 is about 9993.4981362884. The cubic root of 99870005 is about 463.9576683661.

The spelling of 99870005 in words is "ninety-nine million, eight hundred seventy thousand, five".

Divisors: 1 5 19974001 99870005