286040021 has 4 divisors (see below), whose sum is σ = 295903500. Its totient is φ = 276176544.

The previous prime is 286039991. The next prime is 286040023. The reversal of 286040021 is 120040682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 192820996 + 93219025 = 13886^2 + 9655^2 .

It is a cyclic number.

It is not a de Polignac number, because 286040021 - 2¹⁰ = 286038997 is a prime.

It is a super-2 number, since 2×286040021² = 163637787227360882, 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 (286040023) 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, 4931696 + ... + 4931753.

It is an arithmetic number, because the mean of its divisors is an integer number (73975875).

Almost surely, 2^286040021 is an apocalyptic number.

It is an amenable number.

286040021 is a deficient number, since it is larger than the sum of its proper divisors (9863479).

286040021 is an equidigital number, since it uses as much as digits as its factorization.

286040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9863478.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 286040021 is about 16912.7177295667. The cubic root of 286040021 is about 658.8839579134.

The spelling of 286040021 in words is "two hundred eighty-six million, forty thousand, twenty-one".