651340 has 24 divisors (see below), whose sum is σ = 1416240. Its totient is φ = 251328.

The previous prime is 651331. The next prime is 651347. The reversal of 651340 is 43156.

It is not an unprimeable number, because it can be changed into a prime (651347) 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, 19 + ... + 1141.

It is an arithmetic number, because the mean of its divisors is an integer number (59010).

2⁶⁵¹³⁴⁰ 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 651340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (708120).

651340 is an abundant number, since it is smaller than the sum of its proper divisors (764900).

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

651340 is a wasteful number, since it uses less digits than its factorization.

651340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161 (or 1159 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 651340 is about 807.0563796910. The cubic root of 651340 is about 86.6833958501.

Adding to 651340 its reverse (43156), we get a palindrome (694496).

The spelling of 651340 in words is "six hundred fifty-one thousand, three hundred forty".