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12638031 = 372149577
BaseRepresentation
bin110000001101…
…011101001111
3212210002010020
4300031131033
511213404111
61130513223
7212264400
oct60153517
925702106
1012638031
11715215a
124295813
132806533
14196d9a7
151199906
hexc0d74f

12638031 has 24 divisors (see below), whose sum is σ = 19767600. Its totient is φ = 7160832.

The previous prime is 12638027. The next prime is 12638039. The reversal of 12638031 is 13083621.

It is not a de Polignac number, because 12638031 - 22 = 12638027 is a prime.

It is a super-2 number, since 2×126380312 = 319439655113922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12637992 and 12638010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12638039) 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 23 ways as a sum of consecutive naturals, for example, 21615 + ... + 22191.

It is an arithmetic number, because the mean of its divisors is an integer number (823650).

Almost surely, 212638031 is an apocalyptic number.

12638031 is a deficient number, since it is larger than the sum of its proper divisors (7129569).

12638031 is a wasteful number, since it uses less digits than its factorization.

12638031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743 (or 736 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 12638031 is about 3555.0008438818. Note that the first 3 decimals coincide. The cubic root of 12638031 is about 232.9305607022.

The spelling of 12638031 in words is "twelve million, six hundred thirty-eight thousand, thirty-one".

Divisors: 1 3 7 21 49 147 149 447 577 1043 1731 3129 4039 7301 12117 21903 28273 84819 85973 257919 601811 1805433 4212677 12638031