27904389 has 16 divisors (see below), whose sum is σ = 38122560. Its totient is φ = 18149760.

The previous prime is 27904379. The next prime is 27904391. The reversal of 27904389 is 98340972.

It is not a de Polignac number, because 27904389 - 2⁹ = 27903877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27904389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27904379) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24889 + ... + 25985.

It is an arithmetic number, because the mean of its divisors is an integer number (2382660).

Almost surely, 2^27904389 is an apocalyptic number.

It is an amenable number.

27904389 is a deficient number, since it is larger than the sum of its proper divisors (10218171).

27904389 is a wasteful number, since it uses less digits than its factorization.

27904389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300.

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

The square root of 27904389 is about 5282.4605062414. The cubic root of 27904389 is about 303.3128705218.

The spelling of 27904389 in words is "twenty-seven million, nine hundred four thousand, three hundred eighty-nine".