1919887998 has 16 divisors (see below), whose sum is σ = 4388315520. Its totient is φ = 548539416.

The previous prime is 1919887973. The next prime is 1919887999. The reversal of 1919887998 is 8997889191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1919887999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22855768 + ... + 22855851.

It is an arithmetic number, because the mean of its divisors is an integer number (274269720).

Almost surely, 2^1919887998 is an apocalyptic number.

1919887998 is an abundant number, since it is smaller than the sum of its proper divisors (2468427522).

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

1919887998 is a wasteful number, since it uses less digits than its factorization.

1919887998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45711631.

The product of its digits is 23514624, while the sum is 69.

The square root of 1919887998 is about 43816.5265396517. The cubic root of 1919887998 is about 1242.8688341161.

The spelling of 1919887998 in words is "one billion, nine hundred nineteen million, eight hundred eighty-seven thousand, nine hundred ninety-eight".