27198405 has 48 divisors (see below), whose sum is σ = 53464320. Its totient is φ = 12680064.

The previous prime is 27198389. The next prime is 27198407. The reversal of 27198405 is 50489172.

It is not a de Polignac number, because 27198405 - 2⁴ = 27198389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27198405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27198407) 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 47 ways as a sum of consecutive naturals, for example, 9892 + ... + 12338.

It is an arithmetic number, because the mean of its divisors is an integer number (1113840).

Almost surely, 2^27198405 is an apocalyptic number.

It is an amenable number.

27198405 is a deficient number, since it is larger than the sum of its proper divisors (26265915).

27198405 is a wasteful number, since it uses less digits than its factorization.

27198405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2490 (or 2487 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 27198405 is about 5215.2090082757. The cubic root of 27198405 is about 300.7330407122.

The spelling of 27198405 in words is "twenty-seven million, one hundred ninety-eight thousand, four hundred five".