8639397 has 24 divisors (see below), whose sum is σ = 13774488. Its totient is φ = 5184000.

The previous prime is 8639381. The next prime is 8639401. The reversal of 8639397 is 7939368.

It is a happy number.

8639397 is a `hidden beast` number, since 8 + 639 + 3 + 9 + 7 = 666.

8639397 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 720801 + 7918596 = 849^2 + 2814^2 .

It is not a de Polignac number, because 8639397 - 2⁴ = 8639381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8639347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3897 + ... + 5697.

It is an arithmetic number, because the mean of its divisors is an integer number (573937).

Almost surely, 2^8639397 is an apocalyptic number.

It is an amenable number.

8639397 is a deficient number, since it is larger than the sum of its proper divisors (5135091).

8639397 is a wasteful number, since it uses less digits than its factorization.

8639397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861 (or 1858 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 8639397 is about 2939.2851171671. The cubic root of 8639397 is about 205.1923398073.

The spelling of 8639397 in words is "eight million, six hundred thirty-nine thousand, three hundred ninety-seven".