286221340 has 24 divisors (see below), whose sum is σ = 601412112. Its totient is φ = 114422400.

The previous prime is 286221311. The next prime is 286221343. The reversal of 286221340 is 43122682.

It is a junction number, because it is equal to n+sod(n) for n = 286221299 and 286221308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (286221343) 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, 46440 + ... + 52240.

It is an arithmetic number, because the mean of its divisors is an integer number (25058838).

Almost surely, 2^286221340 is an apocalyptic number.

286221340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

286221340 is an abundant number, since it is smaller than the sum of its proper divisors (315190772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

286221340 is a wasteful number, since it uses less digits than its factorization.

286221340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8277 (or 8275 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 286221340 is about 16918.0773139267. The cubic root of 286221340 is about 659.0231493285.

The spelling of 286221340 in words is "two hundred eighty-six million, two hundred twenty-one thousand, three hundred forty".