19404399718 has 16 divisors (see below), whose sum is σ = 32776934400. Its totient is φ = 8535659400.

The previous prime is 19404399671. The next prime is 19404399737. The reversal of 19404399718 is 81799340491.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14225418 + ... + 14226781.

It is an arithmetic number, because the mean of its divisors is an integer number (2048558400).

Almost surely, 2^19404399718 is an apocalyptic number.

19404399718 is a deficient number, since it is larger than the sum of its proper divisors (13372534682).

19404399718 is a wasteful number, since it uses less digits than its factorization.

19404399718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28452243.

The product of its (nonzero) digits is 1959552, while the sum is 55.

It can be divided in two parts, 194043 and 99718, that added together give a triangular number (293761 = T₇₆₆).

The spelling of 19404399718 in words is "nineteen billion, four hundred four million, three hundred ninety-nine thousand, seven hundred eighteen".