27400649 has 4 divisors (see below), whose sum is σ = 27429840. Its totient is φ = 27371460.

The previous prime is 27400643. The next prime is 27400661. The reversal of 27400649 is 94600472.

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 a de Polignac number, because none of the positive numbers 2^k-27400649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27400643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13139 + ... + 15080.

It is an arithmetic number, because the mean of its divisors is an integer number (6857460).

Almost surely, 2^27400649 is an apocalyptic number.

It is an amenable number.

27400649 is a deficient number, since it is larger than the sum of its proper divisors (29191).

27400649 is an equidigital number, since it uses as much as digits as its factorization.

27400649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29190.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 27400649 is about 5234.5629234923. The cubic root of 27400649 is about 301.4766053828.

The spelling of 27400649 in words is "twenty-seven million, four hundred thousand, six hundred forty-nine".