285380021 has 16 divisors (see below), whose sum is σ = 305659008. Its totient is φ = 265848000.

The previous prime is 285379987. The next prime is 285380023. The reversal of 285380021 is 120083582.

It is a cyclic number.

It is not a de Polignac number, because 285380021 - 2⁶ = 285379957 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 (285380023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149171 + ... + 151071.

It is an arithmetic number, because the mean of its divisors is an integer number (19103688).

Almost surely, 2^285380021 is an apocalyptic number.

It is an amenable number.

285380021 is a deficient number, since it is larger than the sum of its proper divisors (20278987).

285380021 is a wasteful number, since it uses less digits than its factorization.

285380021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2092.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 285380021 is about 16893.1945173197. The cubic root of 285380021 is about 658.3768047493.

The spelling of 285380021 in words is "two hundred eighty-five million, three hundred eighty thousand, twenty-one".