1909038813 has 32 divisors (see below), whose sum is σ = 2928614400. Its totient is φ = 1093968000.

The previous prime is 1909038811. The next prime is 1909038821. The reversal of 1909038813 is 3188309091.

It is a happy number.

It is not a de Polignac number, because 1909038813 - 2¹ = 1909038811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909038811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 354088 + ... + 359438.

It is an arithmetic number, because the mean of its divisors is an integer number (91519200).

Almost surely, 2^1909038813 is an apocalyptic number.

It is an amenable number.

1909038813 is a deficient number, since it is larger than the sum of its proper divisors (1019575587).

1909038813 is a wasteful number, since it uses less digits than its factorization.

1909038813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5953.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 1909038813 is about 43692.5487125665. The cubic root of 1909038813 is about 1240.5232817881.

The spelling of 1909038813 in words is "one billion, nine hundred nine million, thirty-eight thousand, eight hundred thirteen".