1909813429 has 4 divisors (see below), whose sum is σ = 1912123584. Its totient is φ = 1907503276.

The previous prime is 1909813403. The next prime is 1909813447. The reversal of 1909813429 is 9243189091.

It is a happy number.

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: 9243189091 = 39869 ⋅231839.

It is a cyclic number.

It is not a de Polignac number, because 1909813429 - 2⁵ = 1909813397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909813489) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1153837 + ... + 1155490.

It is an arithmetic number, because the mean of its divisors is an integer number (478030896).

Almost surely, 2^1909813429 is an apocalyptic number.

It is an amenable number.

1909813429 is a deficient number, since it is larger than the sum of its proper divisors (2310155).

1909813429 is an equidigital number, since it uses as much as digits as its factorization.

1909813429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310154.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 1909813429 is about 43701.4122083028. The cubic root of 1909813429 is about 1240.6910449639.

The spelling of 1909813429 in words is "one billion, nine hundred nine million, eight hundred thirteen thousand, four hundred twenty-nine".