638386441 has 48 divisors (see below), whose sum is σ = 849429504. Its totient is φ = 468864000.

The previous prime is 638386433. The next prime is 638386451. The reversal of 638386441 is 144683836.

It is not a de Polignac number, because 638386441 - 2³ = 638386433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638386421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1076241 + ... + 1076833.

It is an arithmetic number, because the mean of its divisors is an integer number (17696448).

Almost surely, 2^638386441 is an apocalyptic number.

It is an amenable number.

638386441 is a deficient number, since it is larger than the sum of its proper divisors (211043063).

638386441 is a wasteful number, since it uses less digits than its factorization.

638386441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694 (or 683 counting only the distinct ones).

The product of its digits is 331776, while the sum is 43.

The square root of 638386441 is about 25266.3103954653. The cubic root of 638386441 is about 861.0490357929.

The spelling of 638386441 in words is "six hundred thirty-eight million, three hundred eighty-six thousand, four hundred forty-one".