10499809 has 4 divisors (see below), whose sum is σ = 10643716. Its totient is φ = 10355904.

The previous prime is 10499807. The next prime is 10499831. The reversal of 10499809 is 90899401.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6110784 + 4389025 = 2472^2 + 2095^2 .

It is a cyclic number.

It is not a de Polignac number, because 10499809 - 2¹ = 10499807 is a prime.

It is a super-2 number, since 2×10499809² = 220491978072962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10499807) 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, 71844 + ... + 71989.

It is an arithmetic number, because the mean of its divisors is an integer number (2660929).

Almost surely, 2^10499809 is an apocalyptic number.

It is an amenable number.

10499809 is a deficient number, since it is larger than the sum of its proper divisors (143907).

10499809 is an equidigital number, since it uses as much as digits as its factorization.

10499809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143906.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 10499809 is about 3240.3408771301. The cubic root of 10499809 is about 218.9746292274.

The spelling of 10499809 in words is "ten million, four hundred ninety-nine thousand, eight hundred nine".