638257147 has 8 divisors (see below), whose sum is σ = 696474432. Its totient is φ = 580072200.

The previous prime is 638257117. The next prime is 638257183. The reversal of 638257147 is 741752836.

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-638257147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638257117) 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, 53872 + ... + 64642.

It is an arithmetic number, because the mean of its divisors is an integer number (87059304).

Almost surely, 2^638257147 is an apocalyptic number.

638257147 is a deficient number, since it is larger than the sum of its proper divisors (58217285).

638257147 is a wasteful number, since it uses less digits than its factorization.

638257147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16169.

The product of its digits is 282240, while the sum is 43.

The square root of 638257147 is about 25263.7516414328. The cubic root of 638257147 is about 860.9909017309.

The spelling of 638257147 in words is "six hundred thirty-eight million, two hundred fifty-seven thousand, one hundred forty-seven".