638897 has 8 divisors (see below), whose sum is σ = 737856. Its totient is φ = 541872.

The previous prime is 638893. The next prime is 638923. The reversal of 638897 is 798836.

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

It is a cyclic number.

It is not a de Polignac number, because 638897 - 2² = 638893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323 + ... + 1175.

It is an arithmetic number, because the mean of its divisors is an integer number (92232).

2⁶³⁸⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

638897 is a deficient number, since it is larger than the sum of its proper divisors (98959).

638897 is a wasteful number, since it uses less digits than its factorization.

638897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967.

The product of its digits is 72576, while the sum is 41.

The square root of 638897 is about 799.3103277201. The cubic root of 638897 is about 86.1278520194.

The spelling of 638897 in words is "six hundred thirty-eight thousand, eight hundred ninety-seven".