638409603 has 8 divisors (see below), whose sum is σ = 916690768. Its totient is φ = 392867424.

The previous prime is 638409593. The next prime is 638409637. The reversal of 638409603 is 306904836.

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

It is not a de Polignac number, because 638409603 - 2¹⁸ = 638147459 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 16369477 = 638409603 / (6 + 3 + 8 + 4 + 0 + 9 + 6 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638409503) 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, 8184700 + ... + 8184777.

It is an arithmetic number, because the mean of its divisors is an integer number (114586346).

Almost surely, 2^638409603 is an apocalyptic number.

638409603 is a deficient number, since it is larger than the sum of its proper divisors (278281165).

638409603 is a wasteful number, since it uses less digits than its factorization.

638409603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16369493.

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 638409603 is about 25266.7687486944. The cubic root of 638409603 is about 861.0594492224.

The spelling of 638409603 in words is "six hundred thirty-eight million, four hundred nine thousand, six hundred three".