27400891 has 4 divisors (see below), whose sum is σ = 31315312. Its totient is φ = 23486472.

The previous prime is 27400883. The next prime is 27400897. The reversal of 27400891 is 19800472.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27400891 - 2³ = 27400883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27400897) 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 3 ways as a sum of consecutive naturals, for example, 1957200 + ... + 1957213.

It is an arithmetic number, because the mean of its divisors is an integer number (7828828).

Almost surely, 2^27400891 is an apocalyptic number.

27400891 is a deficient number, since it is larger than the sum of its proper divisors (3914421).

27400891 is an equidigital number, since it uses as much as digits as its factorization.

27400891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3914420.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 27400891 is about 5234.5860390293. The cubic root of 27400891 is about 301.4774929180.

The spelling of 27400891 in words is "twenty-seven million, four hundred thousand, eight hundred ninety-one".