2821456 has 80 divisors (see below), whose sum is σ = 6749568. Its totient is φ = 1126400.

The previous prime is 2821451. The next prime is 2821459. The reversal of 2821456 is 6541282.

It is a super-2 number, since 2×2821456² = 15921227919872, which contains 22 as substring.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68796 + ... + 68836.

2^2821456 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 2821456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3374784).

2821456 is an abundant number, since it is smaller than the sum of its proper divisors (3928112).

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

2821456 is a wasteful number, since it uses less digits than its factorization.

2821456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 94 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 2821456 is about 1679.7190241228. The cubic root of 2821456 is about 141.3050752413.

The spelling of 2821456 in words is "two million, eight hundred twenty-one thousand, four hundred fifty-six".