400024013021309 has 2 divisors, whose sum is σ = 400024013021310. Its totient is φ = 400024013021308.

The previous prime is 400024013021291. The next prime is 400024013021377. The reversal of 400024013021309 is 903120310420004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 337614092021284 + 62409921000025 = 18374278^2 + 7899995^2 .

It is a cyclic number.

It is not a de Polignac number, because 400024013021309 - 2²⁰ = 400024011972733 is a prime.

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 (400024013023309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200012006510654 + 200012006510655.

It is an arithmetic number, because the mean of its divisors is an integer number (200012006510655).

Almost surely, 2^{400024013021309} is an apocalyptic number.

It is an amenable number.

400024013021309 is a deficient number, since it is larger than the sum of its proper divisors (1).

400024013021309 is an equidigital number, since it uses as much as digits as its factorization.

400024013021309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 400024013021309 in words is "four hundred trillion, twenty-four billion, thirteen million, twenty-one thousand, three hundred nine".