639541 has 8 divisors (see below), whose sum is σ = 736064. Its totient is φ = 544320.

The previous prime is 639533. The next prime is 639547. The reversal of 639541 is 145936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 639541 - 2³ = 639533 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639547) 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, 1261 + ... + 1693.

It is an arithmetic number, because the mean of its divisors is an integer number (92008).

2⁶³⁹⁵⁴¹ is an apocalyptic number.

It is an amenable number.

639541 is a deficient number, since it is larger than the sum of its proper divisors (96523).

639541 is a wasteful number, since it uses less digits than its factorization.

639541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651.

The product of its digits is 3240, while the sum is 28.

The square root of 639541 is about 799.7130735458. The cubic root of 639541 is about 86.1567808925.

It can be divided in two parts, 63 and 9541, that added together give a square (9604 = 98²).

The spelling of 639541 in words is "six hundred thirty-nine thousand, five hundred forty-one".