8388749 has 4 divisors (see below), whose sum is σ = 8465820. Its totient is φ = 8311680.

The previous prime is 8388739. The next prime is 8388761. The reversal of 8388749 is 9478838.

8388749 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2866249 + 5522500 = 1693^2 + 2350^2 .

It is a cyclic number.

It is not a de Polignac number, because 8388749 - 2⁴ = 8388733 is a prime.

It is a super-2 number, since 2×8388749² = 140742219570002, which contains 22 as substring.

It is a d-powerful number, because it can be written as 8 + 3 + 8⁷ + 8⁷ + 7² + 4¹¹ + 9² .

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8388739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38372 + ... + 38589.

It is an arithmetic number, because the mean of its divisors is an integer number (2116455).

Almost surely, 2^8388749 is an apocalyptic number.

It is an amenable number.

8388749 is a deficient number, since it is larger than the sum of its proper divisors (77071).

8388749 is a wasteful number, since it uses less digits than its factorization.

8388749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77070.

The product of its digits is 387072, while the sum is 47.

The square root of 8388749 is about 2896.3337169601. Note that the first 3 decimals coincide. The cubic root of 8388749 is about 203.1884730710.

The spelling of 8388749 in words is "eight million, three hundred eighty-eight thousand, seven hundred forty-nine".