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16122805 = 513212441
BaseRepresentation
bin111101100000…
…001110110101
31010100010022221
4331200032311
513111412210
61333322341
7254020156
oct75401665
933303287
1016122805
119112336
1254963b1
13345672a
1421d992d
1516371da
hexf603b5

16122805 has 8 divisors (see below), whose sum is σ = 19369944. Its totient is φ = 12883200.

The previous prime is 16122803. The next prime is 16122823. The reversal of 16122805 is 50822161.

It can be written as a sum of positive squares in 4 ways, for example, as 1811716 + 14311089 = 1346^2 + 3783^2 .

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

It is not a de Polignac number, because 16122805 - 21 = 16122803 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16122805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16122803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5385 + ... + 7825.

It is an arithmetic number, because the mean of its divisors is an integer number (2421243).

Almost surely, 216122805 is an apocalyptic number.

It is an amenable number.

16122805 is a deficient number, since it is larger than the sum of its proper divisors (3247139).

16122805 is a wasteful number, since it uses less digits than its factorization.

16122805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3767.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 16122805 is about 4015.3212822886. The cubic root of 16122805 is about 252.6272534400.

Adding to 16122805 its reverse (50822161), we get a palindrome (66944966).

The spelling of 16122805 in words is "sixteen million, one hundred twenty-two thousand, eight hundred five".

Divisors: 1 5 1321 2441 6605 12205 3224561 16122805