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12986621 = 15238527
BaseRepresentation
bin110001100010…
…100011111101
3220102210021222
4301202203331
511311032441
61142203125
7215245604
oct61424375
926383258
1012986621
11737004a
1244234a5
1328c90bb
141a20a3b
151217d4b
hexc628fd

12986621 has 4 divisors (see below), whose sum is σ = 12996672. Its totient is φ = 12976572.

The previous prime is 12986609. The next prime is 12986647. The reversal of 12986621 is 12668921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12986621 - 210 = 12985597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12986221) 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 3 ways as a sum of consecutive naturals, for example, 2741 + ... + 5786.

It is an arithmetic number, because the mean of its divisors is an integer number (3249168).

Almost surely, 212986621 is an apocalyptic number.

It is an amenable number.

12986621 is a deficient number, since it is larger than the sum of its proper divisors (10051).

12986621 is an equidigital number, since it uses as much as digits as its factorization.

12986621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10050.

The product of its digits is 10368, while the sum is 35.

The square root of 12986621 is about 3603.6954643810. The cubic root of 12986621 is about 235.0527782468.

The spelling of 12986621 in words is "twelve million, nine hundred eighty-six thousand, six hundred twenty-one".

Divisors: 1 1523 8527 12986621