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8000005 = 513123077
BaseRepresentation
bin11110100001001000000101
3120001102221111
4132201020011
54022000010
6443245021
7124666426
oct36411005
916042844
108000005
114574582
122819771
131871440
1410c364d
15a8058a
hex7a1205

8000005 has 8 divisors (see below), whose sum is σ = 10338552. Its totient is φ = 5907648.

The previous prime is 7999993. The next prime is 8000009. The reversal of 8000005 is 5000008.

It can be divided in two parts, 800000 and 5, that multiplied together give a square (4000000 = 20002).

It can be written as a sum of positive squares in 4 ways, for example, as 64516 + 7935489 = 254^2 + 2817^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8000005 - 217 = 7868933 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

8000005 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8000009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61474 + ... + 61603.

It is an arithmetic number, because the mean of its divisors is an integer number (1292319).

Almost surely, 28000005 is an apocalyptic number.

It is an amenable number.

8000005 is a deficient number, since it is larger than the sum of its proper divisors (2338547).

8000005 is a wasteful number, since it uses less digits than its factorization.

8000005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123095.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 8000005 is about 2828.4280086295. The cubic root of 8000005 is about 200.0000416667. Note that the first 4 decimals are identical.

The spelling of 8000005 in words is "eight million, five", and thus it is an aban number and an uban number.

Divisors: 1 5 13 65 123077 615385 1600001 8000005