6215840 has 48 divisors (see below), whose sum is σ = 14982408. Its totient is φ = 2436096.

The previous prime is 6215813. The next prime is 6215851. The reversal of 6215840 is 485126.

It can be written as a sum of positive squares in 4 ways, for example, as 6210064 + 5776 = 2492^2 + 76^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8114 + ... + 8846.

Almost surely, 2^6215840 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 6215840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7491204).

6215840 is an abundant number, since it is smaller than the sum of its proper divisors (8766568).

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

6215840 is a wasteful number, since it uses less digits than its factorization.

6215840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801 (or 793 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 6215840 is about 2493.1586391564. The cubic root of 6215840 is about 183.8653709579.

The spelling of 6215840 in words is "six million, two hundred fifteen thousand, eight hundred forty".