403640400409 has 2 divisors, whose sum is σ = 403640400410. Its totient is φ = 403640400408.

The previous prime is 403640400391. The next prime is 403640400433. The reversal of 403640400409 is 904004046304.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 344418744384 + 59221656025 = 586872^2 + 243355^2 .

It is a cyclic number.

It is not a de Polignac number, because 403640400409 - 2¹³ = 403640392217 is a prime.

It is not a weakly prime, because it can be changed into another prime (403640403409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201820200204 + 201820200205.

It is an arithmetic number, because the mean of its divisors is an integer number (201820200205).

Almost surely, 2^403640400409 is an apocalyptic number.

It is an amenable number.

403640400409 is a deficient number, since it is larger than the sum of its proper divisors (1).

403640400409 is an equidigital number, since it uses as much as digits as its factorization.

403640400409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 34.

The spelling of 403640400409 in words is "four hundred three billion, six hundred forty million, four hundred thousand, four hundred nine".