27438949 has 2 divisors, whose sum is σ = 27438950. Its totient is φ = 27438948.

The previous prime is 27438947. The next prime is 27438989. The reversal of 27438949 is 94983472.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27144100 + 294849 = 5210^2 + 543^2 .

It is a cyclic number.

It is not a de Polignac number, because 27438949 - 2¹ = 27438947 is a prime.

Together with 27438947, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 27438899 and 27438908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27438947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13719474 + 13719475.

It is an arithmetic number, because the mean of its divisors is an integer number (13719475).

Almost surely, 2^27438949 is an apocalyptic number.

It is an amenable number.

27438949 is a deficient number, since it is larger than the sum of its proper divisors (1).

27438949 is an equidigital number, since it uses as much as digits as its factorization.

27438949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 46.

The square root of 27438949 is about 5238.2200221067. The cubic root of 27438949 is about 301.6170056865.

It can be divided in two parts, 27 and 438949, that added together give a cube (438976 = 76³).

The spelling of 27438949 in words is "twenty-seven million, four hundred thirty-eight thousand, nine hundred forty-nine".