1919939820 has 48 divisors (see below), whose sum is σ = 5381553408. Its totient is φ = 511439040.

The previous prime is 1919939807. The next prime is 1919939839. The reversal of 1919939820 is 289399191.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41475 + ... + 74565.

It is an arithmetic number, because the mean of its divisors is an integer number (112115696).

Almost surely, 2^1919939820 is an apocalyptic number.

1919939820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1919939820 is an abundant number, since it is smaller than the sum of its proper divisors (3461613588).

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

1919939820 is a wasteful number, since it uses less digits than its factorization.

1919939820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34070 (or 34068 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 51.

The square root of 1919939820 is about 43817.1178878757. The cubic root of 1919939820 is about 1242.8800166034.

The spelling of 1919939820 in words is "one billion, nine hundred nineteen million, nine hundred thirty-nine thousand, eight hundred twenty".