109856439 has 64 divisors (see below), whose sum is σ = 206945280. Its totient is φ = 55935360.

The previous prime is 109856429. The next prime is 109856447. The reversal of 109856439 is 934658901.

It is a happy number.

It is not a de Polignac number, because 109856439 - 2⁷ = 109856311 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 109856394 and 109856403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109856419) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 109689 + ... + 110685.

It is an arithmetic number, because the mean of its divisors is an integer number (3233520).

Almost surely, 2^109856439 is an apocalyptic number.

109856439 is a deficient number, since it is larger than the sum of its proper divisors (97088841).

109856439 is a wasteful number, since it uses less digits than its factorization.

109856439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077 (or 1071 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 109856439 is about 10481.2422450776. The cubic root of 109856439 is about 478.9334522258.

It can be divided in two parts, 10985 and 6439, that added together give a square (17424 = 132²).

The spelling of 109856439 in words is "one hundred nine million, eight hundred fifty-six thousand, four hundred thirty-nine".