638000433 has 18 divisors (see below), whose sum is σ = 1072015074. Its totient is φ = 364571424.

The previous prime is 638000431. The next prime is 638000459. The reversal of 638000433 is 334000836.

It can be written as a sum of positive squares in only one way, i.e., 320875569 + 317124864 = 17913^2 + 17808^2 .

It is not a de Polignac number, because 638000433 - 2¹ = 638000431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638000397 and 638000406.

It is not an unprimeable number, because it can be changed into a prime (638000431) 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 17 ways as a sum of consecutive naturals, for example, 722916 + ... + 723797.

It is an arithmetic number, because the mean of its divisors is an integer number (59556393).

Almost surely, 2^638000433 is an apocalyptic number.

638000433 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

638000433 is a deficient number, since it is larger than the sum of its proper divisors (434014641).

638000433 is a wasteful number, since it uses less digits than its factorization.

638000433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446733 (or 1446723 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 638000433 is about 25258.6704519458. The cubic root of 638000433 is about 860.8754529345.

The spelling of 638000433 in words is "six hundred thirty-eight million, four hundred thirty-three", and thus it is an aban number.