20240400409 has 2 divisors, whose sum is σ = 20240400410. Its totient is φ = 20240400408.

The previous prime is 20240400373. The next prime is 20240400421. The reversal of 20240400409 is 90400404202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18031118400 + 2209282009 = 134280^2 + 47003^2 .

It is a cyclic number.

It is not a de Polignac number, because 20240400409 - 2⁷ = 20240400281 is a prime.

It is not a weakly prime, because it can be changed into another prime (20240400469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10120200204 + 10120200205.

It is an arithmetic number, because the mean of its divisors is an integer number (10120200205).

Almost surely, 2^20240400409 is an apocalyptic number.

It is an amenable number.

20240400409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20240400409 is an equidigital number, since it uses as much as digits as its factorization.

20240400409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

The spelling of 20240400409 in words is "twenty billion, two hundred forty million, four hundred thousand, four hundred nine".