10509218 has 8 divisors (see below), whose sum is σ = 15999312. Its totient is φ = 5176116.

The previous prime is 10509203. The next prime is 10509241. The reversal of 10509218 is 81290501.

It is a happy number.

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

It is a super-2 number, since 2×10509218² = 220887325943048, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39080 + ... + 39347.

It is an arithmetic number, because the mean of its divisors is an integer number (1999914).

Almost surely, 2^10509218 is an apocalyptic number.

10509218 is a deficient number, since it is larger than the sum of its proper divisors (5490094).

10509218 is an equidigital number, since it uses as much as digits as its factorization.

10509218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78496.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 10509218 is about 3241.7924054449. The cubic root of 10509218 is about 219.0400182633.

Adding to 10509218 its reverse (81290501), we get a palindrome (91799719).

The spelling of 10509218 in words is "ten million, five hundred nine thousand, two hundred eighteen".