656340 has 24 divisors (see below), whose sum is σ = 1837920. Its totient is φ = 175008.

The previous prime is 656333. The next prime is 656347. The reversal of 656340 is 43656.

656340 = T₂₆₁ + T₂₆₂ + ... + T₂₇₈.

It is an interprime number because it is at equal distance from previous prime (656333) and next prime (656347).

It is a self number, because there is not a number n which added to its sum of digits gives 656340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656347) 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, 5410 + ... + 5529.

It is an arithmetic number, because the mean of its divisors is an integer number (76580).

2⁶⁵⁶³⁴⁰ is an apocalyptic number.

656340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656340 is an abundant number, since it is smaller than the sum of its proper divisors (1181580).

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

656340 is a wasteful number, since it uses less digits than its factorization.

656340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10951 (or 10949 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 656340 is about 810.1481346026. The cubic root of 656340 is about 86.9046385425.

Adding to 656340 its reverse (43656), we get a palindrome (699996).

The spelling of 656340 in words is "six hundred fifty-six thousand, three hundred forty".