638235193 has 4 divisors (see below), whose sum is σ = 640163728. Its totient is φ = 636306660.

The previous prime is 638235181. The next prime is 638235263. The reversal of 638235193 is 391532836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638235193 is a prime.

It is a super-3 number, since 3×638235193³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638235293) 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 3 ways as a sum of consecutive naturals, for example, 963771 + ... + 964432.

It is an arithmetic number, because the mean of its divisors is an integer number (160040932).

Almost surely, 2^638235193 is an apocalyptic number.

It is an amenable number.

638235193 is a deficient number, since it is larger than the sum of its proper divisors (1928535).

638235193 is a wasteful number, since it uses less digits than its factorization.

638235193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928534.

The product of its digits is 116640, while the sum is 40.

The square root of 638235193 is about 25263.3171416582. The cubic root of 638235193 is about 860.9810298420.

The spelling of 638235193 in words is "six hundred thirty-eight million, two hundred thirty-five thousand, one hundred ninety-three".