109943865 has 16 divisors (see below), whose sum is σ = 195456000. Its totient is φ = 58636656.

The previous prime is 109943849. The next prime is 109943893. The reversal of 109943865 is 568349901.

It is a happy number.

It is not a de Polignac number, because 109943865 - 2⁴ = 109943849 is a prime.

It is a super-2 number, since 2×109943865² = 24175306902276450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 109943865.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407065 + ... + 407334.

It is an arithmetic number, because the mean of its divisors is an integer number (12216000).

Almost surely, 2^109943865 is an apocalyptic number.

109943865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

109943865 is a deficient number, since it is larger than the sum of its proper divisors (85512135).

109943865 is an equidigital number, since it uses as much as digits as its factorization.

109943865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814413 (or 814407 counting only the distinct ones).

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

The square root of 109943865 is about 10485.4120090724. The cubic root of 109943865 is about 479.0604668822.

The spelling of 109943865 in words is "one hundred nine million, nine hundred forty-three thousand, eight hundred sixty-five".