109217408 has 32 divisors (see below), whose sum is σ = 218084160. Its totient is φ = 54482688.

The previous prime is 109217357. The next prime is 109217411. The reversal of 109217408 is 804712901.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81641 + ... + 82967.

It is an arithmetic number, because the mean of its divisors is an integer number (6815130).

Almost surely, 2^109217408 is an apocalyptic number.

It is an amenable number.

109217408 is a deficient number, since it is larger than the sum of its proper divisors (108866752).

109217408 is an equidigital number, since it uses as much as digits as its factorization.

109217408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1984 (or 1972 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 109217408 is about 10450.7132770926. The cubic root of 109217408 is about 478.0029994618.

The spelling of 109217408 in words is "one hundred nine million, two hundred seventeen thousand, four hundred eight".