108388921 has 9 divisors (see below), whose sum is σ = 112568911. Its totient is φ = 104359864.

The previous prime is 108388897. The next prime is 108388997. The reversal of 108388921 is 129883801.

The square root of 108388921 is 10411.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 56836521 + 51552400 = 7539^2 + 7180^2 .

It is not a de Polignac number, because 108388921 - 2⁷ = 108388793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108388321) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 301740 + ... + 302098.

Almost surely, 2^108388921 is an apocalyptic number.

108388921 is the 10411-st square number.

108388921 is the 5206-th centered octagonal number.

It is an amenable number.

108388921 is a deficient number, since it is larger than the sum of its proper divisors (4179990).

108388921 is an frugal number, since it uses more digits than its factorization.

108388921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 40.

The cubic root of 108388921 is about 476.7912730022.

The spelling of 108388921 in words is "one hundred eight million, three hundred eighty-eight thousand, nine hundred twenty-one".