639284141 has 8 divisors (see below), whose sum is σ = 648937080. Its totient is φ = 629655552.

The previous prime is 639284137. The next prime is 639284143. The reversal of 639284141 is 141482936.

It can be written as a sum of positive squares in 4 ways, for example, as 4748041 + 634536100 = 2179^2 + 25190^2 .

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 639284141 - 2² = 639284137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639284095 and 639284104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639284143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50765 + ... + 62093.

It is an arithmetic number, because the mean of its divisors is an integer number (81117135).

Almost surely, 2^639284141 is an apocalyptic number.

It is an amenable number.

639284141 is a deficient number, since it is larger than the sum of its proper divisors (9652939).

639284141 is a wasteful number, since it uses less digits than its factorization.

639284141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12175.

The product of its digits is 41472, while the sum is 38.

The square root of 639284141 is about 25284.0689170078. The cubic root of 639284141 is about 861.4524495865.

The spelling of 639284141 in words is "six hundred thirty-nine million, two hundred eighty-four thousand, one hundred forty-one".