1338440981 has 2 divisors, whose sum is σ = 1338440982. Its totient is φ = 1338440980.

The previous prime is 1338440963. The next prime is 1338441011. The reversal of 1338440981 is 1890448331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 776513956 + 561927025 = 27866^2 + 23705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1338440981 is a prime.

It is a super-2 number, since 2×1338440981² = 3582848519240484722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1338440281) by changing a digit.

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 as a sum of consecutive naturals, namely, 669220490 + 669220491.

It is an arithmetic number, because the mean of its divisors is an integer number (669220491).

Almost surely, 2^1338440981 is an apocalyptic number.

It is an amenable number.

1338440981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338440981 is an equidigital number, since it uses as much as digits as its factorization.

1338440981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 1338440981 is about 36584.7096612779. The cubic root of 1338440981 is about 1102.0460489232.

The spelling of 1338440981 in words is "one billion, three hundred thirty-eight million, four hundred forty thousand, nine hundred eighty-one".