27157891 has 16 divisors (see below), whose sum is σ = 30723840. Its totient is φ = 23869440.

The previous prime is 27157873. The next prime is 27157901. The reversal of 27157891 is 19875172.

It is a cyclic number.

It is not a de Polignac number, because 27157891 - 2⁹ = 27157379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27157831) 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 15 ways as a sum of consecutive naturals, for example, 14395 + ... + 16171.

It is an arithmetic number, because the mean of its divisors is an integer number (1920240).

Almost surely, 2^27157891 is an apocalyptic number.

27157891 is a deficient number, since it is larger than the sum of its proper divisors (3565949).

27157891 is a wasteful number, since it uses less digits than its factorization.

27157891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1854.

The product of its digits is 35280, while the sum is 40.

The square root of 27157891 is about 5211.3233444107. The cubic root of 27157891 is about 300.5836452725.

The spelling of 27157891 in words is "twenty-seven million, one hundred fifty-seven thousand, eight hundred ninety-one".