281327389 has 4 divisors (see below), whose sum is σ = 321517024. Its totient is φ = 241137756.

The previous prime is 281327377. The next prime is 281327393. The reversal of 281327389 is 983723182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 281327389 - 2¹³ = 281319197 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 (281327369) 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, 20094807 + ... + 20094820.

It is an arithmetic number, because the mean of its divisors is an integer number (80379256).

Almost surely, 2^281327389 is an apocalyptic number.

It is an amenable number.

281327389 is a deficient number, since it is larger than the sum of its proper divisors (40189635).

281327389 is an equidigital number, since it uses as much as digits as its factorization.

281327389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40189634.

The product of its digits is 145152, while the sum is 43.

The square root of 281327389 is about 16772.8169667471. The cubic root of 281327389 is about 655.2454368355.

The spelling of 281327389 in words is "two hundred eighty-one million, three hundred twenty-seven thousand, three hundred eighty-nine".