1913907809 has 16 divisors (see below), whose sum is σ = 2253813120. Its totient is φ = 1606872960.

The previous prime is 1913907797. The next prime is 1913907833. The reversal of 1913907809 is 9087093191.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1913907809 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 (1913907409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123092 + ... + 137765.

It is an arithmetic number, because the mean of its divisors is an integer number (140863320).

Almost surely, 2^1913907809 is an apocalyptic number.

It is an amenable number.

1913907809 is a deficient number, since it is larger than the sum of its proper divisors (339905311).

1913907809 is a wasteful number, since it uses less digits than its factorization.

1913907809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260920.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 1913907809 is about 43748.2320671362. The cubic root of 1913907809 is about 1241.5770363500.

The spelling of 1913907809 in words is "one billion, nine hundred thirteen million, nine hundred seven thousand, eight hundred nine".