638647341 has 8 divisors (see below), whose sum is σ = 859961184. Its totient is φ = 421549200.

The previous prime is 638647333. The next prime is 638647393. The reversal of 638647341 is 143746836.

It is a happy number.

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

It is not a de Polignac number, because 638647341 - 2³ = 638647333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638647293 and 638647302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638647301) 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, 1053571 + ... + 1054176.

It is an arithmetic number, because the mean of its divisors is an integer number (107495148).

Almost surely, 2^638647341 is an apocalyptic number.

It is an amenable number.

638647341 is a deficient number, since it is larger than the sum of its proper divisors (221313843).

638647341 is a wasteful number, since it uses less digits than its factorization.

638647341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107851.

The product of its digits is 290304, while the sum is 42.

The square root of 638647341 is about 25271.4728696212. The cubic root of 638647341 is about 861.1663195584.

The spelling of 638647341 in words is "six hundred thirty-eight million, six hundred forty-seven thousand, three hundred forty-one".