1909985424 has 20 divisors (see below), whose sum is σ = 4934129136. Its totient is φ = 636661792.

The previous prime is 1909985383. The next prime is 1909985437. The reversal of 1909985424 is 4245899091.

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 3 ways as a sum of consecutive naturals, for example, 19895634 + ... + 19895729.

Almost surely, 2^1909985424 is an apocalyptic number.

It is an amenable number.

1909985424 is an abundant number, since it is smaller than the sum of its proper divisors (3024143712).

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

1909985424 is a wasteful number, since it uses less digits than its factorization.

1909985424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39791374 (or 39791368 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 51.

The square root of 1909985424 is about 43703.3800065853. The cubic root of 1909985424 is about 1240.7282887853.

The spelling of 1909985424 in words is "one billion, nine hundred nine million, nine hundred eighty-five thousand, four hundred twenty-four".