19371899427904 has 21 divisors (see below), whose sum is σ = 38441182798837. Its totient is φ = 9685932108544.

The previous prime is 19371899427889. The next prime is 19371899427917. The reversal of 19371899427904 is 40972499817391.

The square root of 19371899427904 is 4401352.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4372080266304 + 14999819161600 = 2090952^2 + 3872960^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 34935732 + ... + 35485900.

Almost surely, 2^{19371899427904} is an apocalyptic number.

19371899427904 is the 4401352-nd square number.

It is an amenable number.

19371899427904 is a deficient number, since it is larger than the sum of its proper divisors (19069283370933).

19371899427904 is an frugal number, since it uses more digits than its factorization.

19371899427904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100350 (or 550171 counting only the distinct ones).

The product of its (nonzero) digits is 246903552, while the sum is 73.

The spelling of 19371899427904 in words is "nineteen trillion, three hundred seventy-one billion, eight hundred ninety-nine million, four hundred twenty-seven thousand, nine hundred four".