27390321 has 24 divisors (see below), whose sum is σ = 45368960. Its totient is φ = 15598656.

The previous prime is 27390277. The next prime is 27390361. The reversal of 27390321 is 12309372.

It is not a de Polignac number, because 27390321 - 2⁷ = 27390193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27390361) 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, 25236 + ... + 26298.

Almost surely, 2^27390321 is an apocalyptic number.

27390321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

27390321 is a deficient number, since it is larger than the sum of its proper divisors (17978639).

27390321 is a wasteful number, since it uses less digits than its factorization.

27390321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485 (or 1482 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 27390321 is about 5233.5763107076. The cubic root of 27390321 is about 301.4387225615.

Adding to 27390321 its reverse (12309372), we get a palindrome (39699693).

The spelling of 27390321 in words is "twenty-seven million, three hundred ninety thousand, three hundred twenty-one".