1440236981 has 2 divisors, whose sum is σ = 1440236982. Its totient is φ = 1440236980.

The previous prime is 1440236953. The next prime is 1440237047. The reversal of 1440236981 is 1896320441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1106626756 + 333610225 = 33266^2 + 18265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1440236981 is a prime.

It is a super-2 number, since 2×1440236981² = 4148565122879988722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1440236921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720118490 + 720118491.

It is an arithmetic number, because the mean of its divisors is an integer number (720118491).

Almost surely, 2^1440236981 is an apocalyptic number.

It is an amenable number.

1440236981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440236981 is an equidigital number, since it uses as much as digits as its factorization.

1440236981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 1440236981 is about 37950.4542924060. The cubic root of 1440236981 is about 1129.3051778313.

The spelling of 1440236981 in words is "one billion, four hundred forty million, two hundred thirty-six thousand, nine hundred eighty-one".