109191920 has 40 divisors (see below), whose sum is σ = 262066560. Its totient is φ = 42266880.

The previous prime is 109191913. The next prime is 109191923. The reversal of 109191920 is 29191901.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109191923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19535 + ... + 24494.

It is an arithmetic number, because the mean of its divisors is an integer number (6551664).

Almost surely, 2^109191920 is an apocalyptic number.

109191920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

109191920 is an abundant number, since it is smaller than the sum of its proper divisors (152874640).

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

109191920 is a wasteful number, since it uses less digits than its factorization.

109191920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44073 (or 44067 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 109191920 is about 10449.4937676425. The cubic root of 109191920 is about 477.9658128126.

The spelling of 109191920 in words is "one hundred nine million, one hundred ninety-one thousand, nine hundred twenty".