103920009 has 4 divisors (see below), whose sum is σ = 138560016. Its totient is φ = 69280004.

The previous prime is 103919999. The next prime is 103920041. The reversal of 103920009 is 900029301.

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: 900029301 = 3 ⋅300009767.

It is a cyclic number.

It is not a de Polignac number, because 103920009 - 2¹⁵ = 103887241 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (103920059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17319999 + ... + 17320004.

It is an arithmetic number, because the mean of its divisors is an integer number (34640004).

Almost surely, 2^103920009 is an apocalyptic number.

It is an amenable number.

103920009 is a deficient number, since it is larger than the sum of its proper divisors (34640007).

103920009 is an equidigital number, since it uses as much as digits as its factorization.

103920009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34640006.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 103920009 is about 10194.1163913308. The cubic root of 103920009 is about 470.1463389190.

The spelling of 103920009 in words is "one hundred three million, nine hundred twenty thousand, nine".