427391 has 4 divisors (see below), whose sum is σ = 429312. Its totient is φ = 425472.

The previous prime is 427381. The next prime is 427403. The reversal of 427391 is 193724.

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

It is a cyclic number.

It is not a de Polignac number, because 427391 - 2⁶ = 427327 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 427391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427351) 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, 575 + ... + 1088.

It is an arithmetic number, because the mean of its divisors is an integer number (107328).

2⁴²⁷³⁹¹ is an apocalyptic number.

427391 is a deficient number, since it is larger than the sum of its proper divisors (1921).

427391 is a wasteful number, since it uses less digits than its factorization.

427391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920.

The product of its digits is 1512, while the sum is 26.

The square root of 427391 is about 653.7514818339. The cubic root of 427391 is about 75.3254597109.

It can be divided in two parts, 427 and 391, that added together give a palindrome (818).

The spelling of 427391 in words is "four hundred twenty-seven thousand, three hundred ninety-one".