638469007 has 4 divisors (see below), whose sum is σ = 696511656. Its totient is φ = 580426360.

The previous prime is 638468977. The next prime is 638469011. The reversal of 638469007 is 700964836.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638469007 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 (638469047) 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, 29021308 + ... + 29021329.

It is an arithmetic number, because the mean of its divisors is an integer number (174127914).

Almost surely, 2^638469007 is an apocalyptic number.

638469007 is a deficient number, since it is larger than the sum of its proper divisors (58042649).

638469007 is a wasteful number, since it uses less digits than its factorization.

638469007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58042648.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 638469007 is about 25267.9442574975. The cubic root of 638469007 is about 861.0861555819.

The spelling of 638469007 in words is "six hundred thirty-eight million, four hundred sixty-nine thousand, seven".