19819390000 has 50 divisors (see below), whose sum is σ = 47984749340. Its totient is φ = 7927752000.

The previous prime is 19819389983. The next prime is 19819390009. The reversal of 19819390000 is 9391891.

It is a tau number, because it is divible by the number of its divisors (50).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (19819390009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 980970 + ... + 1000969.

Almost surely, 2^19819390000 is an apocalyptic number.

19819390000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19819390000 is an abundant number, since it is smaller than the sum of its proper divisors (28165359340).

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

19819390000 is an equidigital number, since it uses as much as digits as its factorization.

19819390000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981967 (or 1981946 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 40.

The spelling of 19819390000 in words is "nineteen billion, eight hundred nineteen million, three hundred ninety thousand".