1340981 has 2 divisors, whose sum is σ = 1340982. Its totient is φ = 1340980.

The previous prime is 1340959. The next prime is 1341007. The reversal of 1340981 is 1890431.

It is an a-pointer prime, because the next prime (1341007) can be obtained adding 1340981 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1188100 + 152881 = 1090^2 + 391^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340981 is a prime.

It is a super-2 number, since 2×1340981² = 3596460084722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1340981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670490 + 670491.

It is an arithmetic number, because the mean of its divisors is an integer number (670491).

2^1340981 is an apocalyptic number.

It is an amenable number.

1340981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340981 is an equidigital number, since it uses as much as digits as its factorization.

1340981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1340981 is about 1158.0073402185. The cubic root of 1340981 is about 110.2742742333.

The spelling of 1340981 in words is "one million, three hundred forty thousand, nine hundred eighty-one".