19690378893440 has 32 divisors (see below), whose sum is σ = 47072312043660. Its totient is φ = 7876151557120.

The previous prime is 19690378893407. The next prime is 19690378893491. The reversal of 19690378893440 is 4439887309691.

It can be written as a sum of positive squares in 2 ways, for example, as 18837474926656 + 852903966784 = 4340216^2 + 923528^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×19690378893440² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15383107871 + ... + 15383109150.

Almost surely, 2^{19690378893440} is an apocalyptic number.

19690378893440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19690378893440 is an abundant number, since it is smaller than the sum of its proper divisors (27381933150220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19690378893440 is an equidigital number, since it uses as much as digits as its factorization.

19690378893440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30766217040 (or 30766217028 counting only the distinct ones).

The product of its (nonzero) digits is 282175488, while the sum is 71.

The spelling of 19690378893440 in words is "nineteen trillion, six hundred ninety billion, three hundred seventy-eight million, eight hundred ninety-three thousand, four hundred forty".