19913190400 has 66 divisors (see below), whose sum is σ = 49360662020. Its totient is φ = 7965265920.

The previous prime is 19913190371. The next prime is 19913190403. The reversal of 19913190400 is 409131991.

It is a self number, because there is not a number n which added to its sum of digits gives 19913190400.

It is not an unprimeable number, because it can be changed into a prime (19913190403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 363330 + ... + 414529.

Almost surely, 2^19913190400 is an apocalyptic number.

19913190400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19913190400 is an abundant number, since it is smaller than the sum of its proper divisors (29447471620).

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

19913190400 is an equidigital number, since it uses as much as digits as its factorization.

19913190400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777889 (or 777866 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 37.

The spelling of 19913190400 in words is "nineteen billion, nine hundred thirteen million, one hundred ninety thousand, four hundred".