654140 has 12 divisors (see below), whose sum is σ = 1373736. Its totient is φ = 261648.

The previous prime is 654127. The next prime is 654149. The reversal of 654140 is 41456.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 32707 = 654140 / (6 + 5 + 4 + 1 + 4 + 0).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 654140.

It is not an unprimeable number, because it can be changed into a prime (654149) by changing a digit.

654140 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16334 + ... + 16373.

It is an arithmetic number, because the mean of its divisors is an integer number (114478).

2⁶⁵⁴¹⁴⁰ is an apocalyptic number.

It is an amenable number.

654140 is an abundant number, since it is smaller than the sum of its proper divisors (719596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

654140 is a wasteful number, since it uses less digits than its factorization.

654140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32716 (or 32714 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 654140 is about 808.7892185236. The cubic root of 654140 is about 86.8074306819.

Adding to 654140 its reverse (41456), we get a palindrome (695596).

The spelling of 654140 in words is "six hundred fifty-four thousand, one hundred forty".