1919140864 has 55 divisors (see below), whose sum is σ = 3942974387. Its totient is φ = 933636096.

The previous prime is 1919140843. The next prime is 1919140889. The reversal of 1919140864 is 4680419191.

The square root of 1919140864 is 43808.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 1196606464 + 722534400 = 34592^2 + 26880^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=4, B=148.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1919140864.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 4 ways as a sum of consecutive naturals, for example, 51868654 + ... + 51868690.

Almost surely, 2^1919140864 is an apocalyptic number.

1919140864 is the 43808-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1919140864

1919140864 is an abundant number, since it is smaller than the sum of its proper divisors (2023833523).

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

1919140864 is an frugal number, since it uses more digits than its factorization.

1919140864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 39 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The cubic root of 1919140864 is about 1242.7075903273.

The spelling of 1919140864 in words is "one billion, nine hundred nineteen million, one hundred forty thousand, eight hundred sixty-four".