8520399 has 12 divisors (see below), whose sum is σ = 12332736. Its totient is φ = 5668512.

The previous prime is 8520389. The next prime is 8520401. The reversal of 8520399 is 9930258.

It is not a de Polignac number, because 8520399 - 2⁹ = 8519887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8520329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7219 + ... + 8315.

It is an arithmetic number, because the mean of its divisors is an integer number (1027728).

Almost surely, 2^8520399 is an apocalyptic number.

8520399 is a deficient number, since it is larger than the sum of its proper divisors (3812337).

8520399 is a wasteful number, since it uses less digits than its factorization.

8520399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966 (or 1963 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 8520399 is about 2918.9722506389. The cubic root of 8520399 is about 204.2458828704.

The spelling of 8520399 in words is "eight million, five hundred twenty thousand, three hundred ninety-nine".