487639 has 4 divisors (see below), whose sum is σ = 489424. Its totient is φ = 485856.

The previous prime is 487637. The next prime is 487649. The reversal of 487639 is 936784.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 487639 - 2¹ = 487637 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 487598 and 487607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (487637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387 + ... + 1060.

It is an arithmetic number, because the mean of its divisors is an integer number (122356).

2⁴⁸⁷⁶³⁹ is an apocalyptic number.

487639 is a deficient number, since it is larger than the sum of its proper divisors (1785).

487639 is a wasteful number, since it uses less digits than its factorization.

487639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784.

The product of its digits is 36288, while the sum is 37.

The square root of 487639 is about 698.3115350615. The cubic root of 487639 is about 78.7105252735.

The spelling of 487639 in words is "four hundred eighty-seven thousand, six hundred thirty-nine".