10218409 has 4 divisors (see below), whose sum is σ = 10756240. Its totient is φ = 9680580.

The previous prime is 10218359. The next prime is 10218421. The reversal of 10218409 is 90481201.

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: 90481201 = 1759 ⋅51439.

It is a cyclic number.

It is not a de Polignac number, because 10218409 - 2¹⁹ = 9694121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10218449) 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, 268887 + ... + 268924.

It is an arithmetic number, because the mean of its divisors is an integer number (2689060).

Almost surely, 2^10218409 is an apocalyptic number.

10218409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

10218409 is a deficient number, since it is larger than the sum of its proper divisors (537831).

10218409 is an equidigital number, since it uses as much as digits as its factorization.

10218409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537830.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 10218409 is about 3196.6246260704. The cubic root of 10218409 is about 217.0006795621. Note that the first 3 decimals are identical.

The spelling of 10218409 in words is "ten million, two hundred eighteen thousand, four hundred nine".