654985 has 8 divisors (see below), whose sum is σ = 794376. Its totient is φ = 518400.

The previous prime is 654967. The next prime is 654991. The reversal of 654985 is 589456.

It can be written as a sum of positive squares in 4 ways, for example, as 451584 + 203401 = 672^2 + 451^2 .

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

It is not a de Polignac number, because 654985 - 2¹¹ = 652937 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

654985 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144 + ... + 1153.

It is an arithmetic number, because the mean of its divisors is an integer number (99297).

2⁶⁵⁴⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

654985 is a deficient number, since it is larger than the sum of its proper divisors (139391).

654985 is a wasteful number, since it uses less digits than its factorization.

654985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1403.

The product of its digits is 43200, while the sum is 37.

The square root of 654985 is about 809.3114357279. The cubic root of 654985 is about 86.8447930797.

It can be divided in two parts, 65 and 4985, that added together give a triangular number (5050 = T₁₀₀).

The spelling of 654985 in words is "six hundred fifty-four thousand, nine hundred eighty-five".