27649421 has 2 divisors, whose sum is σ = 27649422. Its totient is φ = 27649420.

The previous prime is 27649399. The next prime is 27649439. The reversal of 27649421 is 12494672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26677225 + 972196 = 5165^2 + 986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27649421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27649451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13824710 + 13824711.

It is an arithmetic number, because the mean of its divisors is an integer number (13824711).

Almost surely, 2^27649421 is an apocalyptic number.

It is an amenable number.

27649421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27649421 is an equidigital number, since it uses as much as digits as its factorization.

27649421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 27649421 is about 5258.2716742291. The cubic root of 27649421 is about 302.3862322906.

The spelling of 27649421 in words is "twenty-seven million, six hundred forty-nine thousand, four hundred twenty-one".