109439985 has 16 divisors (see below), whose sum is σ = 178073280. Its totient is φ = 57378240.

The previous prime is 109439977. The next prime is 109439989. The reversal of 109439985 is 589934901.

It is not a de Polignac number, because 109439985 - 2³ = 109439977 is a prime.

It is a super-2 number, since 2×109439985² = 23954220633600450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (109439989) 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, 60946 + ... + 62715.

It is an arithmetic number, because the mean of its divisors is an integer number (11129580).

Almost surely, 2^109439985 is an apocalyptic number.

109439985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

109439985 is a deficient number, since it is larger than the sum of its proper divisors (68633295).

109439985 is a wasteful number, since it uses less digits than its factorization.

109439985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123728.

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 109439985 is about 10461.3567475734. The cubic root of 109439985 is about 478.3274907187.

The spelling of 109439985 in words is "one hundred nine million, four hundred thirty-nine thousand, nine hundred eighty-five".