193920909 has 48 divisors (see below), whose sum is σ = 323743104. Its totient is φ = 101088000.

The previous prime is 193920899. The next prime is 193920911. The reversal of 193920909 is 909029391.

It is a happy number.

It is not a de Polignac number, because 193920909 - 2⁵ = 193920877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (193920929) 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 47 ways as a sum of consecutive naturals, for example, 358179 + ... + 358719.

It is an arithmetic number, because the mean of its divisors is an integer number (6744648).

Almost surely, 2^193920909 is an apocalyptic number.

It is an amenable number.

193920909 is a deficient number, since it is larger than the sum of its proper divisors (129822195).

193920909 is a wasteful number, since it uses less digits than its factorization.

193920909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678 (or 665 counting only the distinct ones).

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 193920909 is about 13925.5487863136. The cubic root of 193920909 is about 578.8173573267.

The spelling of 193920909 in words is "one hundred ninety-three million, nine hundred twenty thousand, nine hundred nine".