108742721 has 8 divisors (see below), whose sum is σ = 112906920. Its totient is φ = 104606208.

The previous prime is 108742703. The next prime is 108742747. The reversal of 108742721 is 127247801.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 28890625 + 79852096 = 5375^2 + 8936^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 108742721 - 2¹⁰ = 108741697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108742021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1265 + ... + 14801.

It is an arithmetic number, because the mean of its divisors is an integer number (14113365).

Almost surely, 2^108742721 is an apocalyptic number.

It is an amenable number.

108742721 is a deficient number, since it is larger than the sum of its proper divisors (4164199).

108742721 is a wasteful number, since it uses less digits than its factorization.

108742721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13843.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 108742721 is about 10427.9778001298. The cubic root of 108742721 is about 477.3094856878.

The spelling of 108742721 in words is "one hundred eight million, seven hundred forty-two thousand, seven hundred twenty-one".