27855989 has 4 divisors (see below), whose sum is σ = 31835424. Its totient is φ = 23876556.

The previous prime is 27855983. The next prime is 27855991. The reversal of 27855989 is 98955872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27855989 - 2⁸ = 27855733 is a prime.

It is a super-2 number, since 2×27855989² = 1551912246336242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27855989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27855983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1989707 + ... + 1989720.

It is an arithmetic number, because the mean of its divisors is an integer number (7958856).

Almost surely, 2^27855989 is an apocalyptic number.

It is an amenable number.

27855989 is a deficient number, since it is larger than the sum of its proper divisors (3979435).

27855989 is an equidigital number, since it uses as much as digits as its factorization.

27855989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3979434.

The product of its digits is 1814400, while the sum is 53.

The square root of 27855989 is about 5277.8773195291. The cubic root of 27855989 is about 303.1374042325.

The spelling of 27855989 in words is "twenty-seven million, eight hundred fifty-five thousand, nine hundred eighty-nine".