10405809 has 12 divisors (see below), whose sum is σ = 15549300. Its totient is φ = 6697824.

The previous prime is 10405799. The next prime is 10405873. The reversal of 10405809 is 90850401.

It can be written as a sum of positive squares in 2 ways, for example, as 5688225 + 4717584 = 2385^2 + 2172^2 .

It is not a de Polignac number, because 10405809 - 2¹¹ = 10403761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10415809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19674 + ... + 20195.

It is an arithmetic number, because the mean of its divisors is an integer number (1295775).

Almost surely, 2^10405809 is an apocalyptic number.

It is an amenable number.

10405809 is a deficient number, since it is larger than the sum of its proper divisors (5143491).

10405809 is a wasteful number, since it uses less digits than its factorization.

10405809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39904 (or 39901 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 10405809 is about 3225.8036208052. The cubic root of 10405809 is about 218.3192094406.

The spelling of 10405809 in words is "ten million, four hundred five thousand, eight hundred nine".