638741049 has 16 divisors (see below), whose sum is σ = 873523200. Its totient is φ = 414940176.

The previous prime is 638741029. The next prime is 638741071. The reversal of 638741049 is 940147836.

It is not a de Polignac number, because 638741049 - 2¹² = 638736953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638741049.

It is not an unprimeable number, because it can be changed into a prime (638741029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50992 + ... + 62270.

It is an arithmetic number, because the mean of its divisors is an integer number (54595200).

Almost surely, 2^638741049 is an apocalyptic number.

It is an amenable number.

638741049 is a deficient number, since it is larger than the sum of its proper divisors (234782151).

638741049 is a wasteful number, since it uses less digits than its factorization.

638741049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11764.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 638741049 is about 25273.3268288922. The cubic root of 638741049 is about 861.2084368176.

The spelling of 638741049 in words is "six hundred thirty-eight million, seven hundred forty-one thousand, forty-nine".