27953989 has 4 divisors (see below), whose sum is σ = 31947424. Its totient is φ = 23960556.

The previous prime is 27953977. The next prime is 27954029. The reversal of 27953989 is 98935972.

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 27953989 - 2⁵ = 27953957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27953969) 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, 1996707 + ... + 1996720.

It is an arithmetic number, because the mean of its divisors is an integer number (7986856).

Almost surely, 2^27953989 is an apocalyptic number.

It is an amenable number.

27953989 is a deficient number, since it is larger than the sum of its proper divisors (3993435).

27953989 is an equidigital number, since it uses as much as digits as its factorization.

27953989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993434.

The product of its digits is 1224720, while the sum is 52.

The square root of 27953989 is about 5287.1532037572. The cubic root of 27953989 is about 303.4924768366.

The spelling of 27953989 in words is "twenty-seven million, nine hundred fifty-three thousand, nine hundred eighty-nine".