109249128 has 64 divisors (see below), whose sum is σ = 308040000. Its totient is φ = 35868096.

The previous prime is 109249121. The next prime is 109249139. The reversal of 109249128 is 821942901.

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

It is a junction number, because it is equal to n+sod(n) for n = 109249092 and 109249101.

It is not an unprimeable number, because it can be changed into a prime (109249121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10698 + ... + 18246.

It is an arithmetic number, because the mean of its divisors is an integer number (4813125).

Almost surely, 2^109249128 is an apocalyptic number.

109249128 is a gapful number since it is divisible by the number (18) 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 109249128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154020000).

109249128 is an abundant number, since it is smaller than the sum of its proper divisors (198790872).

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

109249128 is a wasteful number, since it uses less digits than its factorization.

109249128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7631 (or 7621 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 109249128 is about 10452.2307666833. The cubic root of 109249128 is about 478.0492704358.

The spelling of 109249128 in words is "one hundred nine million, two hundred forty-nine thousand, one hundred twenty-eight".