8621399 has 4 divisors (see below), whose sum is σ = 8627280. Its totient is φ = 8615520.

The previous prime is 8621377. The next prime is 8621411. The reversal of 8621399 is 9931268.

8621399 is digitally balanced in base 2, 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8621399 - 2⁸ = 8621143 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 (8621309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1247 + ... + 4335.

It is an arithmetic number, because the mean of its divisors is an integer number (2156820).

Almost surely, 2^8621399 is an apocalyptic number.

8621399 is a deficient number, since it is larger than the sum of its proper divisors (5881).

8621399 is a wasteful number, since it uses less digits than its factorization.

8621399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5880.

The product of its digits is 23328, while the sum is 38.

The square root of 8621399 is about 2936.2218921601. The cubic root of 8621399 is about 205.0497519539.

The spelling of 8621399 in words is "eight million, six hundred twenty-one thousand, three hundred ninety-nine".