427857381 has 72 divisors (see below), whose sum is σ = 753472512. Its totient is φ = 229003200.

The previous prime is 427857379. The next prime is 427857407. The reversal of 427857381 is 183758724.

427857381 is a `hidden beast` number, since 4 + 2 + 78 + 573 + 8 + 1 = 666.

It is not a de Polignac number, because 427857381 - 2¹ = 427857379 is a prime.

It is a super-2 number, since 2×427857381² = 366123876952358322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427857341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2239996 + ... + 2240186.

It is an arithmetic number, because the mean of its divisors is an integer number (10464896).

Almost surely, 2^427857381 is an apocalyptic number.

It is an amenable number.

427857381 is a deficient number, since it is larger than the sum of its proper divisors (325615131).

427857381 is a wasteful number, since it uses less digits than its factorization.

427857381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 269 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 427857381 is about 20684.7137036025. The cubic root of 427857381 is about 753.5284883273.

The spelling of 427857381 in words is "four hundred twenty-seven million, eight hundred fifty-seven thousand, three hundred eighty-one".