27438669 has 20 divisors (see below), whose sum is σ = 42405660. Its totient is φ = 17660160.

The previous prime is 27438661. The next prime is 27438673. The reversal of 27438669 is 96683472.

It can be written as a sum of positive squares in 2 ways, for example, as 14152644 + 13286025 = 3762^2 + 3645^2 .

It is not a de Polignac number, because 27438669 - 2³ = 27438661 is a prime.

It is a super-2 number, since 2×27438669² = 1505761112983122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27438661) 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 19 ways as a sum of consecutive naturals, for example, 3492 + ... + 8189.

It is an arithmetic number, because the mean of its divisors is an integer number (2120283).

Almost surely, 2^27438669 is an apocalyptic number.

27438669 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

27438669 is a deficient number, since it is larger than the sum of its proper divisors (14966991).

27438669 is a wasteful number, since it uses less digits than its factorization.

27438669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11722 (or 11713 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 27438669 is about 5238.1932954025. The cubic root of 27438669 is about 301.6159797355.

The spelling of 27438669 in words is "twenty-seven million, four hundred thirty-eight thousand, six hundred sixty-nine".