285421381 has 8 divisors (see below), whose sum is σ = 345384000. Its totient is φ = 230255808.

The previous prime is 285421351. The next prime is 285421397. The reversal of 285421381 is 183124582.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 285421381 - 2¹⁵ = 285388613 is a prime.

It is a super-2 number, since 2×285421381² = 162930729463894322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285421351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1199131 + ... + 1199368.

It is an arithmetic number, because the mean of its divisors is an integer number (43173000).

Almost surely, 2^285421381 is an apocalyptic number.

It is an amenable number.

285421381 is a deficient number, since it is larger than the sum of its proper divisors (59962619).

285421381 is a wasteful number, since it uses less digits than its factorization.

285421381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398523.

The product of its digits is 15360, while the sum is 34.

The square root of 285421381 is about 16894.4186345669. The cubic root of 285421381 is about 658.4086092990.

The spelling of 285421381 in words is "two hundred eighty-five million, four hundred twenty-one thousand, three hundred eighty-one".