109139940 has 192 divisors, whose sum is σ = 418091520. Its totient is φ = 23016960.

The previous prime is 109139929. The next prime is 109139941. The reversal of 109139940 is 49931901.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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 = 109139895 and 109139904.

It is not an unprimeable number, because it can be changed into a prime (109139941) 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 63 ways as a sum of consecutive naturals, for example, 48030 + ... + 50250.

It is an arithmetic number, because the mean of its divisors is an integer number (2177560).

Almost surely, 2^109139940 is an apocalyptic number.

109139940 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 109139940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209045760).

109139940 is an abundant number, since it is smaller than the sum of its proper divisors (308951580).

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

109139940 is a wasteful number, since it uses less digits than its factorization.

109139940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2259 (or 2251 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 109139940 is about 10447.0062697406. The cubic root of 109139940 is about 477.8899567530.

It can be divided in two parts, 10 and 9139940, that added together give a triangular number (9139950 = T₄₂₇₅).

The spelling of 109139940 in words is "one hundred nine million, one hundred thirty-nine thousand, nine hundred forty".