10019809 has 8 divisors (see below), whose sum is σ = 10319400. Its totient is φ = 9724416.

The previous prime is 10019791. The next prime is 10019813. The reversal of 10019809 is 90891001.

10019809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3629025 + 6390784 = 1905^2 + 2528^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10019809 - 2⁵ = 10019777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10019839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4167 + ... + 6115.

It is an arithmetic number, because the mean of its divisors is an integer number (1289925).

Almost surely, 2^10019809 is an apocalyptic number.

It is an amenable number.

10019809 is a deficient number, since it is larger than the sum of its proper divisors (299591).

10019809 is an equidigital number, since it uses as much as digits as its factorization.

10019809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 10019809 is about 3165.4081885280. The cubic root of 10019809 is about 215.5856324965.

The spelling of 10019809 in words is "ten million, nineteen thousand, eight hundred nine".