27998403 has 4 divisors (see below), whose sum is σ = 37331208. Its totient is φ = 18665600.

The previous prime is 27998393. The next prime is 27998423. The reversal of 27998403 is 30489972.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27998403 - 2⁹ = 27997891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27998423) 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, 4666398 + ... + 4666403.

It is an arithmetic number, because the mean of its divisors is an integer number (9332802).

Almost surely, 2^27998403 is an apocalyptic number.

27998403 is a deficient number, since it is larger than the sum of its proper divisors (9332805).

27998403 is an equidigital number, since it uses as much as digits as its factorization.

27998403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9332804.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 27998403 is about 5291.3517176616. The cubic root of 27998403 is about 303.6531239438.

The spelling of 27998403 in words is "twenty-seven million, nine hundred ninety-eight thousand, four hundred three".