109215540 has 120 divisors (see below), whose sum is σ = 391598592. Its totient is φ = 24960960.

The previous prime is 109215521. The next prime is 109215577. The reversal of 109215540 is 45512901.

109215540 is a `hidden beast` number, since 109 + 2 + 1 + 554 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6525 + ... + 16155.

Almost surely, 2^109215540 is an apocalyptic number.

109215540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 109215540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195799296).

109215540 is an abundant number, since it is smaller than the sum of its proper divisors (282383052).

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

109215540 is a wasteful number, since it uses less digits than its factorization.

109215540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9659 (or 9648 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 109215540 is about 10450.6239048202. The cubic root of 109215540 is about 478.0002742714. Note that the first 3 decimals are identical.

It can be divided in two parts, 10921 and 5540, that added together give a palindrome (16461).

The spelling of 109215540 in words is "one hundred nine million, two hundred fifteen thousand, five hundred forty".