7821460 has 12 divisors (see below), whose sum is σ = 16425108. Its totient is φ = 3128576.

The previous prime is 7821427. The next prime is 7821461. The reversal of 7821460 is 641287.

It can be written as a sum of positive squares in 2 ways, for example, as 2650384 + 5171076 = 1628^2 + 2274^2 .

It is a super-2 number, since 2×7821460² = 122350473063200, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7821461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195517 + ... + 195556.

It is an arithmetic number, because the mean of its divisors is an integer number (1368759).

Almost surely, 2^7821460 is an apocalyptic number.

It is an amenable number.

7821460 is an abundant number, since it is smaller than the sum of its proper divisors (8603648).

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

7821460 is a wasteful number, since it uses less digits than its factorization.

7821460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391082 (or 391080 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 7821460 is about 2796.6873261057. The cubic root of 7821460 is about 198.5009591200.

It can be divided in two parts, 7821 and 460, that added together give a square (8281 = 91²).

The spelling of 7821460 in words is "seven million, eight hundred twenty-one thousand, four hundred sixty".