1909474889 has 4 divisors (see below), whose sum is σ = 2182257024. Its totient is φ = 1636692756.

The previous prime is 1909474883. The next prime is 1909474907. The reversal of 1909474889 is 9884749091.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9884749091 = 7 ⋅1412107013.

It is a cyclic number.

It is not a de Polignac number, because 1909474889 - 2¹² = 1909470793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1909474883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136391057 + ... + 136391070.

It is an arithmetic number, because the mean of its divisors is an integer number (545564256).

Almost surely, 2^1909474889 is an apocalyptic number.

It is an amenable number.

1909474889 is a deficient number, since it is larger than the sum of its proper divisors (272782135).

1909474889 is an equidigital number, since it uses as much as digits as its factorization.

1909474889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272782134.

The product of its (nonzero) digits is 5225472, while the sum is 59.

The square root of 1909474889 is about 43697.5387064306. The cubic root of 1909474889 is about 1240.6177309322.

The spelling of 1909474889 in words is "one billion, nine hundred nine million, four hundred seventy-four thousand, eight hundred eighty-nine".