427581 has 24 divisors (see below), whose sum is σ = 771264. Its totient is φ = 221760.

The previous prime is 427579. The next prime is 427591. The reversal of 427581 is 185724.

It is not a de Polignac number, because 427581 - 2¹ = 427579 is a prime.

It is a super-2 number, since 2×427581² = 365651023122, which contains 22 as substring.

427581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 385 + ... + 1001.

It is an arithmetic number, because the mean of its divisors is an integer number (32136).

2⁴²⁷⁵⁸¹ is an apocalyptic number.

It is an amenable number.

427581 is a deficient number, since it is larger than the sum of its proper divisors (343683).

427581 is a wasteful number, since it uses less digits than its factorization.

427581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 638 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 427581 is about 653.8967808454. The cubic root of 427581 is about 75.3366202306.

It can be divided in two parts, 4275 and 81, that added together give a square (4356 = 66²).

The spelling of 427581 in words is "four hundred twenty-seven thousand, five hundred eighty-one".