1919433808 has 80 divisors (see below), whose sum is σ = 4026974400. Its totient is φ = 883491840.

The previous prime is 1919433797. The next prime is 1919433821. The reversal of 1919433808 is 8083349191.

It is a happy number.

It is a super-2 number, since 2×1919433808² = 7368452286586761728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1649835 + ... + 1650997.

It is an arithmetic number, because the mean of its divisors is an integer number (50337180).

Almost surely, 2^1919433808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1919433808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2013487200).

1919433808 is an abundant number, since it is smaller than the sum of its proper divisors (2107540592).

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

1919433808 is a wasteful number, since it uses less digits than its factorization.

1919433808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340 (or 1334 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 1919433808 is about 43811.3433713234. The cubic root of 1919433808 is about 1242.7708174407.

The spelling of 1919433808 in words is "one billion, nine hundred nineteen million, four hundred thirty-three thousand, eight hundred eight".