1268021982 has 64 divisors (see below), whose sum is σ = 2634508800. Its totient is φ = 406686720.

The previous prime is 1268021971. The next prime is 1268021983. The reversal of 1268021982 is 2891208621.

It is a self number, because there is not a number n which added to its sum of digits gives 1268021982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268021983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5261382 + ... + 5261622.

It is an arithmetic number, because the mean of its divisors is an integer number (41164200).

Almost surely, 2^1268021982 is an apocalyptic number.

1268021982 is an abundant number, since it is smaller than the sum of its proper divisors (1366486818).

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

1268021982 is a wasteful number, since it uses less digits than its factorization.

1268021982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 1268021982 is about 35609.2962862228. The cubic root of 1268021982 is about 1082.3696204182.

The spelling of 1268021982 in words is "one billion, two hundred sixty-eight million, twenty-one thousand, nine hundred eighty-two".