27438431 has 2 divisors, whose sum is σ = 27438432. Its totient is φ = 27438430.

The previous prime is 27438427. The next prime is 27438469. The reversal of 27438431 is 13483472.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27438431 - 2² = 27438427 is a prime.

It is a super-2 number, since 2×27438431² = 1505734991483522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27438401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13719215 + 13719216.

It is an arithmetic number, because the mean of its divisors is an integer number (13719216).

Almost surely, 2^27438431 is an apocalyptic number.

27438431 is a deficient number, since it is larger than the sum of its proper divisors (1).

27438431 is an equidigital number, since it uses as much as digits as its factorization.

27438431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 32.

The square root of 27438431 is about 5238.1705775967. The cubic root of 27438431 is about 301.6151076717.

The spelling of 27438431 in words is "twenty-seven million, four hundred thirty-eight thousand, four hundred thirty-one".