27157989 has 4 divisors (see below), whose sum is σ = 36210656. Its totient is φ = 18105324.

The previous prime is 27157987. The next prime is 27158029. The reversal of 27157989 is 98975172.

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 not a de Polignac number, because 27157989 - 2¹ = 27157987 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 (27157987) 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, 4526329 + ... + 4526334.

It is an arithmetic number, because the mean of its divisors is an integer number (9052664).

Almost surely, 2^27157989 is an apocalyptic number.

It is an amenable number.

27157989 is a deficient number, since it is larger than the sum of its proper divisors (9052667).

27157989 is an equidigital number, since it uses as much as digits as its factorization.

27157989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9052666.

The product of its digits is 317520, while the sum is 48.

The square root of 27157989 is about 5211.3327470044. The cubic root of 27157989 is about 300.5840068268.

The spelling of 27157989 in words is "twenty-seven million, one hundred fifty-seven thousand, nine hundred eighty-nine".