638330126 has 16 divisors (see below), whose sum is σ = 1095198720. Its totient is φ = 273340440.

The previous prime is 638330123. The next prime is 638330149. The reversal of 638330126 is 621033836.

It is a junction number, because it is equal to n+sod(n) for n = 638330092 and 638330101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638330123) 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, 1286 + ... + 35753.

It is an arithmetic number, because the mean of its divisors is an integer number (68449920).

Almost surely, 2^638330126 is an apocalyptic number.

638330126 is a deficient number, since it is larger than the sum of its proper divisors (456868594).

638330126 is a wasteful number, since it uses less digits than its factorization.

638330126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38279.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 638330126 is about 25265.1959422443. The cubic root of 638330126 is about 861.0237160183.

The spelling of 638330126 in words is "six hundred thirty-eight million, three hundred thirty thousand, one hundred twenty-six".