27997438 has 8 divisors (see below), whose sum is σ = 47995632. Its totient is φ = 11998896.

The previous prime is 27997421. The next prime is 27997481. The reversal of 27997438 is 83479972.

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

It is a junction number, because it is equal to n+sod(n) for n = 27997391 and 27997400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 999895 + ... + 999922.

It is an arithmetic number, because the mean of its divisors is an integer number (5999454).

Almost surely, 2^27997438 is an apocalyptic number.

27997438 is a deficient number, since it is larger than the sum of its proper divisors (19998194).

27997438 is a wasteful number, since it uses less digits than its factorization.

27997438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999826.

The product of its digits is 762048, while the sum is 49.

The square root of 27997438 is about 5291.2605303462. The cubic root of 27997438 is about 303.6496353087.

The spelling of 27997438 in words is "twenty-seven million, nine hundred ninety-seven thousand, four hundred thirty-eight".