27990493 has 2 divisors, whose sum is σ = 27990494. Its totient is φ = 27990492.

The previous prime is 27990461. The next prime is 27990503. The reversal of 27990493 is 39409972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14462809 + 13527684 = 3803^2 + 3678^2 .

It is a cyclic number.

It is not a de Polignac number, because 27990493 - 2⁵ = 27990461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27991493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13995246 + 13995247.

It is an arithmetic number, because the mean of its divisors is an integer number (13995247).

Almost surely, 2^27990493 is an apocalyptic number.

It is an amenable number.

27990493 is a deficient number, since it is larger than the sum of its proper divisors (1).

27990493 is an equidigital number, since it uses as much as digits as its factorization.

27990493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 27990493 is about 5290.6042188015. The cubic root of 27990493 is about 303.6245256170.

The spelling of 27990493 in words is "twenty-seven million, nine hundred ninety thousand, four hundred ninety-three".