1021286340 has 96 divisors (see below), whose sum is σ = 3182175360. Its totient is φ = 271928448.

The previous prime is 1021286317. The next prime is 1021286363. The reversal of 1021286340 is 436821201.

1021286340 is a `hidden beast` number, since 1 + 0 + 2 + 1 + 28 + 634 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1021286317) and next prime (1021286363).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 546087 + ... + 547953.

It is an arithmetic number, because the mean of its divisors is an integer number (33147660).

Almost surely, 2^1021286340 is an apocalyptic number.

1021286340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021286340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1591087680).

1021286340 is an abundant number, since it is smaller than the sum of its proper divisors (2160889020).

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

1021286340 is a wasteful number, since it uses less digits than its factorization.

1021286340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2898 (or 2890 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1021286340 is about 31957.5709339743. The cubic root of 1021286340 is about 1007.0456883556.

The spelling of 1021286340 in words is "one billion, twenty-one million, two hundred eighty-six thousand, three hundred forty".