109409172 has 24 divisors (see below), whose sum is σ = 260106336. Its totient is φ = 35781408.

The previous prime is 109409171. The next prime is 109409203. The reversal of 109409172 is 271904901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109409171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85378 + ... + 86649.

It is an arithmetic number, because the mean of its divisors is an integer number (10837764).

Almost surely, 2^109409172 is an apocalyptic number.

109409172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

109409172 is an abundant number, since it is smaller than the sum of its proper divisors (150697164).

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

109409172 is a wasteful number, since it uses less digits than its factorization.

109409172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172087 (or 172085 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 109409172 is about 10459.8839381706. The cubic root of 109409172 is about 478.2825952191.

The spelling of 109409172 in words is "one hundred nine million, four hundred nine thousand, one hundred seventy-two".