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27694021 = 43644047
BaseRepresentation
bin110100110100…
…1001111000101
31221010000001111
41221221033011
524042202041
62425325021
7454252405
oct151511705
957100044
1027694021
11146a5a23
129336771
1359784c4
14396c805
152670981
hex1a693c5

27694021 has 4 divisors (see below), whose sum is σ = 28338112. Its totient is φ = 27049932.

The previous prime is 27693979. The next prime is 27694031. The reversal of 27694021 is 12049672.

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.

It is a cyclic number.

It is not a de Polignac number, because 27694021 - 27 = 27693893 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 (27694031) 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, 321981 + ... + 322066.

It is an arithmetic number, because the mean of its divisors is an integer number (7084528).

Almost surely, 227694021 is an apocalyptic number.

It is an amenable number.

27694021 is a deficient number, since it is larger than the sum of its proper divisors (644091).

27694021 is an equidigital number, since it uses as much as digits as its factorization.

27694021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644090.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 27694021 is about 5262.5109026015. The cubic root of 27694021 is about 302.5487333547.

The spelling of 27694021 in words is "twenty-seven million, six hundred ninety-four thousand, twenty-one".

Divisors: 1 43 644047 27694021