538686397 has 8 divisors (see below), whose sum is σ = 558279000. Its totient is φ = 519161664.

The previous prime is 538686383. The next prime is 538686419. The reversal of 538686397 is 793686835.

It can be written as a sum of positive squares in 4 ways, for example, as 111809476 + 426876921 = 10574^2 + 20661^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-538686397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538686307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 522 + ... + 32827.

It is an arithmetic number, because the mean of its divisors is an integer number (69784875).

Almost surely, 2^538686397 is an apocalyptic number.

It is an amenable number.

538686397 is a deficient number, since it is larger than the sum of its proper divisors (19592603).

538686397 is a wasteful number, since it uses less digits than its factorization.

538686397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33935.

The product of its digits is 6531840, while the sum is 55.

The square root of 538686397 is about 23209.6186310762. The cubic root of 538686397 is about 813.6644401050.

The spelling of 538686397 in words is "five hundred thirty-eight million, six hundred eighty-six thousand, three hundred ninety-seven".