1919365820 has 24 divisors (see below), whose sum is σ = 4056347904. Its totient is φ = 762854976.

The previous prime is 1919365813. The next prime is 1919365823. The reversal of 1919365820 is 285639191.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1919365823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302492 + ... + 308771.

It is an arithmetic number, because the mean of its divisors is an integer number (169014496).

Almost surely, 2^1919365820 is an apocalyptic number.

1919365820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1919365820 is an abundant number, since it is smaller than the sum of its proper divisors (2136982084).

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

1919365820 is a wasteful number, since it uses less digits than its factorization.

1919365820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611429 (or 611427 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 1919365820 is about 43810.5674466789. The cubic root of 1919365820 is about 1242.7561439295.

The spelling of 1919365820 in words is "one billion, nine hundred nineteen million, three hundred sixty-five thousand, eight hundred twenty".