1909663474 has 4 divisors (see below), whose sum is σ = 2864495214. Its totient is φ = 954831736.

The previous prime is 1909663463. The next prime is 1909663513. The reversal of 1909663474 is 4743669091.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1909078249 + 585225 = 43693^2 + 765^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 as a sum of consecutive naturals, namely, 477415867 + ... + 477415870.

Almost surely, 2^1909663474 is an apocalyptic number.

1909663474 is a deficient number, since it is larger than the sum of its proper divisors (954831740).

1909663474 is an equidigital number, since it uses as much as digits as its factorization.

1909663474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954831739.

The product of its (nonzero) digits is 979776, while the sum is 49.

The square root of 1909663474 is about 43699.6964978019. The cubic root of 1909663474 is about 1240.6585718625.

The spelling of 1909663474 in words is "one billion, nine hundred nine million, six hundred sixty-three thousand, four hundred seventy-four".