438078003691 has 2 divisors, whose sum is σ = 438078003692. Its totient is φ = 438078003690.

The previous prime is 438078003667. The next prime is 438078003697. The reversal of 438078003691 is 196300870834.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 438078003691 - 2⁷ = 438078003563 is a prime.

It is not a weakly prime, because it can be changed into another prime (438078003697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219039001845 + 219039001846.

It is an arithmetic number, because the mean of its divisors is an integer number (219039001846).

Almost surely, 2^438078003691 is an apocalyptic number.

438078003691 is a deficient number, since it is larger than the sum of its proper divisors (1).

438078003691 is an equidigital number, since it uses as much as digits as its factorization.

438078003691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 438078003691 in words is "four hundred thirty-eight billion, seventy-eight million, three thousand, six hundred ninety-one".