108439940 has 144 divisors (see below), whose sum is σ = 293715072. Its totient is φ = 33352704.

The previous prime is 108439931. The next prime is 108439949. The reversal of 108439940 is 49934801.

It is an interprime number because it is at equal distance from previous prime (108439931) and next prime (108439949).

It is a junction number, because it is equal to n+sod(n) for n = 108439894 and 108439903.

It is not an unprimeable number, because it can be changed into a prime (108439949) 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 47 ways as a sum of consecutive naturals, for example, 383039 + ... + 383321.

It is an arithmetic number, because the mean of its divisors is an integer number (2039688).

Almost surely, 2^108439940 is an apocalyptic number.

108439940 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 108439940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146857536).

108439940 is an abundant number, since it is smaller than the sum of its proper divisors (185275132).

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

108439940 is a wasteful number, since it uses less digits than its factorization.

108439940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 108439940 is about 10413.4499566666. The cubic root of 108439940 is about 476.8660703095.

The spelling of 108439940 in words is "one hundred eight million, four hundred thirty-nine thousand, nine hundred forty".