638849007 has 12 divisors (see below), whose sum is σ = 923001040. Its totient is φ = 425798208.

The previous prime is 638848949. The next prime is 638849021. The reversal of 638849007 is 700948836.

It is a happy number.

638849007 is a `hidden beast` number, since 638 + 8 + 4 + 9 + 0 + 0 + 7 = 666.

It is not a de Polignac number, because 638849007 - 2¹⁰ = 638847983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638847007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69558 + ... + 78204.

Almost surely, 2^638849007 is an apocalyptic number.

638849007 is a deficient number, since it is larger than the sum of its proper divisors (284152033).

638849007 is a wasteful number, since it uses less digits than its factorization.

638849007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16862 (or 16859 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 638849007 is about 25275.4625476963. The cubic root of 638849007 is about 861.2569536633.

The spelling of 638849007 in words is "six hundred thirty-eight million, eight hundred forty-nine thousand, seven".