4001388127409 has 2 divisors, whose sum is σ = 4001388127410. Its totient is φ = 4001388127408.

The previous prime is 4001388127397. The next prime is 4001388127459. The reversal of 4001388127409 is 9047218831004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2659926141184 + 1341461986225 = 1630928^2 + 1158215^2 .

It is a cyclic number.

It is not a de Polignac number, because 4001388127409 - 2¹⁶ = 4001388061873 is a prime.

It is a super-2 number, since 2×4001388127409² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4001388127459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000694063704 + 2000694063705.

It is an arithmetic number, because the mean of its divisors is an integer number (2000694063705).

Almost surely, 2^{4001388127409} is an apocalyptic number.

It is an amenable number.

4001388127409 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001388127409 is an equidigital number, since it uses as much as digits as its factorization.

4001388127409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 4001388127409 in words is "four trillion, one billion, three hundred eighty-eight million, one hundred twenty-seven thousand, four hundred nine".