638103747 has 8 divisors (see below), whose sum is σ = 851288256. Its totient is φ = 425160872.

The previous prime is 638103709. The next prime is 638103749. The reversal of 638103747 is 747301836.

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

It is a cyclic number.

It is not a de Polignac number, because 638103747 - 2¹⁰ = 638102723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638103749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54153 + ... + 64874.

It is an arithmetic number, because the mean of its divisors is an integer number (106411032).

Almost surely, 2^638103747 is an apocalyptic number.

638103747 is a deficient number, since it is larger than the sum of its proper divisors (213184509).

638103747 is a wasteful number, since it uses less digits than its factorization.

638103747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120817.

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 638103747 is about 25260.7154886793. The cubic root of 638103747 is about 860.9219187787.

The spelling of 638103747 in words is "six hundred thirty-eight million, one hundred three thousand, seven hundred forty-seven".