638151943 has 24 divisors (see below), whose sum is σ = 760334256. Its totient is φ = 535323360.

The previous prime is 638151937. The next prime is 638151953. The reversal of 638151943 is 349151836.

It is not a de Polignac number, because 638151943 - 2²¹ = 636054791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638151896 and 638151905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638151953) 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 23 ways as a sum of consecutive naturals, for example, 223521 + ... + 226357.

It is an arithmetic number, because the mean of its divisors is an integer number (31680594).

Almost surely, 2^638151943 is an apocalyptic number.

638151943 is a deficient number, since it is larger than the sum of its proper divisors (122182313).

638151943 is a wasteful number, since it uses less digits than its factorization.

638151943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2896 (or 2861 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 638151943 is about 25261.6694420618. The cubic root of 638151943 is about 860.9435933879.

The spelling of 638151943 in words is "six hundred thirty-eight million, one hundred fifty-one thousand, nine hundred forty-three".