285477921 has 6 divisors (see below), whose sum is σ = 412357010. Its totient is φ = 190318608.

The previous prime is 285477847. The next prime is 285477949. The reversal of 285477921 is 129774582.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 249008400 + 36469521 = 15780^2 + 6039^2 .

It is a de Polignac number, because none of the positive numbers 2^k-285477921 is a prime.

It is a super-3 number, since 3×285477921³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285477121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15859876 + ... + 15859893.

Almost surely, 2^285477921 is an apocalyptic number.

It is an amenable number.

285477921 is a deficient number, since it is larger than the sum of its proper divisors (126879089).

285477921 is a wasteful number, since it uses less digits than its factorization.

285477921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31719775 (or 31719772 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 285477921 is about 16896.0918854036. The cubic root of 285477921 is about 658.4520818247.

The spelling of 285477921 in words is "two hundred eighty-five million, four hundred seventy-seven thousand, nine hundred twenty-one".