8390749 has 4 divisors (see below), whose sum is σ = 8617564. Its totient is φ = 8163936.

The previous prime is 8390747. The next prime is 8390771. The reversal of 8390749 is 9470938.

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 3132900 + 5257849 = 1770^2 + 2293^2 .

It is a cyclic number.

It is not a de Polignac number, because 8390749 - 2¹ = 8390747 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8390743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113352 + ... + 113425.

It is an arithmetic number, because the mean of its divisors is an integer number (2154391).

Almost surely, 2^8390749 is an apocalyptic number.

It is an amenable number.

8390749 is a deficient number, since it is larger than the sum of its proper divisors (226815).

8390749 is a wasteful number, since it uses less digits than its factorization.

8390749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226814.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 8390749 is about 2896.6789604649. The cubic root of 8390749 is about 203.2046194855.

The spelling of 8390749 in words is "eight million, three hundred ninety thousand, seven hundred forty-nine".