638142607 has 4 divisors (see below), whose sum is σ = 671729080. Its totient is φ = 604556136.

The previous prime is 638142601. The next prime is 638142611. The reversal of 638142607 is 706241836.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-638142607 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 (638142601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16793208 + ... + 16793245.

It is an arithmetic number, because the mean of its divisors is an integer number (167932270).

Almost surely, 2^638142607 is an apocalyptic number.

638142607 is a deficient number, since it is larger than the sum of its proper divisors (33586473).

638142607 is a wasteful number, since it uses less digits than its factorization.

638142607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33586472.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 638142607 is about 25261.4846554988. The cubic root of 638142607 is about 860.9393949058.

The spelling of 638142607 in words is "six hundred thirty-eight million, one hundred forty-two thousand, six hundred seven".