1909129274 has 16 divisors (see below), whose sum is σ = 3265389288. Its totient is φ = 829304832.

The previous prime is 1909129249. The next prime is 1909129279. The reversal of 1909129274 is 4729219091.

It can be written as a sum of positive squares in 4 ways, for example, as 1698676225 + 210453049 = 41215^2 + 14507^2 .

It is not an unprimeable number, because it can be changed into a prime (1909129279) 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 7 ways as a sum of consecutive naturals, for example, 2159207 + ... + 2160090.

Almost surely, 2^1909129274 is an apocalyptic number.

1909129274 is a deficient number, since it is larger than the sum of its proper divisors (1356260014).

1909129274 is a wasteful number, since it uses less digits than its factorization.

1909129274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4319329.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 1909129274 is about 43693.5838996986. The cubic root of 1909129274 is about 1240.5428758029.

The spelling of 1909129274 in words is "one billion, nine hundred nine million, one hundred twenty-nine thousand, two hundred seventy-four".