109218456 has 80 divisors (see below), whose sum is σ = 315839040. Its totient is φ = 35225280.

The previous prime is 109218449. The next prime is 109218469. The reversal of 109218456 is 654812901.

It is a super-2 number, since 2×109218456² = 23857342262047872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 109218456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17370 + ... + 22806.

It is an arithmetic number, because the mean of its divisors is an integer number (3947988).

Almost surely, 2^109218456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 109218456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157919520).

109218456 is an abundant number, since it is smaller than the sum of its proper divisors (206620584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

109218456 is a wasteful number, since it uses less digits than its factorization.

109218456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5486 (or 5473 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 109218456 is about 10450.7634170906. The cubic root of 109218456 is about 478.0045283559.

The spelling of 109218456 in words is "one hundred nine million, two hundred eighteen thousand, four hundred fifty-six".