654040 has 32 divisors (see below), whose sum is σ = 1496880. Its totient is φ = 257152.

The previous prime is 654029. The next prime is 654047. The reversal of 654040 is 40456.

It is a junction number, because it is equal to n+sod(n) for n = 653999 and 654017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654047) by changing a digit.

654040 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3222 + ... + 3418.

2⁶⁵⁴⁰⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 654040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (748440).

654040 is an abundant number, since it is smaller than the sum of its proper divisors (842840).

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

654040 is a wasteful number, since it uses less digits than its factorization.

654040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 654040 is about 808.7273953564. The cubic root of 654040 is about 86.8030069675.

Adding to 654040 its reverse (40456), we get a palindrome (694496).

The spelling of 654040 in words is "six hundred fifty-four thousand, forty".