27390389 has 4 divisors (see below), whose sum is σ = 29497356. Its totient is φ = 25283424.

The previous prime is 27390379. The next prime is 27390431. The reversal of 27390389 is 98309372.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10923025 + 16467364 = 3305^2 + 4058^2 .

It is a cyclic number.

It is not a de Polignac number, because 27390389 - 2⁸ = 27390133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27390379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1053464 + ... + 1053489.

It is an arithmetic number, because the mean of its divisors is an integer number (7374339).

Almost surely, 2^27390389 is an apocalyptic number.

It is an amenable number.

27390389 is a deficient number, since it is larger than the sum of its proper divisors (2106967).

27390389 is a wasteful number, since it uses less digits than its factorization.

27390389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106966.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 27390389 is about 5233.5828072173. The cubic root of 27390389 is about 301.4389720148.

The spelling of 27390389 in words is "twenty-seven million, three hundred ninety thousand, three hundred eighty-nine".