8721338 has 4 divisors (see below), whose sum is σ = 13082010. Its totient is φ = 4360668.

The previous prime is 8721329. The next prime is 8721359. The reversal of 8721338 is 8331278.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7166329 + 1555009 = 2677^2 + 1247^2 .

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2180333 + ... + 2180336.

Almost surely, 2^8721338 is an apocalyptic number.

8721338 is a deficient number, since it is larger than the sum of its proper divisors (4360672).

8721338 is a wasteful number, since it uses less digits than its factorization.

8721338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4360671.

The product of its digits is 8064, while the sum is 32.

The square root of 8721338 is about 2953.1911553437. The cubic root of 8721338 is about 205.8390202424.

The spelling of 8721338 in words is "eight million, seven hundred twenty-one thousand, three hundred thirty-eight".