285606421 has 4 divisors (see below), whose sum is σ = 285799212. Its totient is φ = 285413632.

The previous prime is 285606401. The next prime is 285606427. The reversal of 285606421 is 124606582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124606582 = 2 ⋅62303291.

It can be written as a sum of positive squares in 2 ways, for example, as 181872196 + 103734225 = 13486^2 + 10185^2 .

It is a cyclic number.

It is not a de Polignac number, because 285606421 - 2⁵ = 285606389 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 (285606427) 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, 94156 + ... + 97141.

It is an arithmetic number, because the mean of its divisors is an integer number (71449803).

Almost surely, 2^285606421 is an apocalyptic number.

It is an amenable number.

285606421 is a deficient number, since it is larger than the sum of its proper divisors (192791).

285606421 is a wasteful number, since it uses less digits than its factorization.

285606421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192790.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 285606421 is about 16899.8941120943. The cubic root of 285606421 is about 658.5508616770.

The spelling of 285606421 in words is "two hundred eighty-five million, six hundred six thousand, four hundred twenty-one".