1920574440 has 48 divisors (see below), whose sum is σ = 6241868100. Its totient is φ = 512153088.

The previous prime is 1920574421. The next prime is 1920574471. The reversal of 1920574440 is 444750291.

It is a happy number.

1920574440 is a `hidden beast` number, since 1 + 9 + 205 + 7 + 4 + 440 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1795894884 + 124679556 = 42378^2 + 11166^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1920574395 and 1920574404.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 2667105 + ... + 2667824.

Almost surely, 2^1920574440 is an apocalyptic number.

1920574440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1920574440 is an abundant number, since it is smaller than the sum of its proper divisors (4321293660).

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

1920574440 is a wasteful number, since it uses less digits than its factorization.

1920574440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5334946 (or 5334939 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 1920574440 is about 43824.3589799098. The cubic root of 1920574440 is about 1243.0169427053.

The spelling of 1920574440 in words is "one billion, nine hundred twenty million, five hundred seventy-four thousand, four hundred forty".