639280541 has 8 divisors (see below), whose sum is σ = 652562784. Its totient is φ = 626043600.

The previous prime is 639280519. The next prime is 639280547. The reversal of 639280541 is 145082936.

It is a happy number.

639280541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 639280541 - 2¹⁰ = 639279517 is a prime.

It is a super-2 number, since 2×639280541² = 817359220202505362, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639280495 and 639280504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639280547) 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, 17966 + ... + 40016.

It is an arithmetic number, because the mean of its divisors is an integer number (81570348).

Almost surely, 2^639280541 is an apocalyptic number.

It is an amenable number.

639280541 is a deficient number, since it is larger than the sum of its proper divisors (13282243).

639280541 is a wasteful number, since it uses less digits than its factorization.

639280541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22651.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 639280541 is about 25283.9977258344. The cubic root of 639280541 is about 861.4508325515.

The spelling of 639280541 in words is "six hundred thirty-nine million, two hundred eighty thousand, five hundred forty-one".