2821684 has 6 divisors (see below), whose sum is σ = 4937954. Its totient is φ = 1410840.

The previous prime is 2821681. The next prime is 2821699. The reversal of 2821684 is 4861282.

It can be written as a sum of positive squares in only one way, i.e., 1876900 + 944784 = 1370^2 + 972^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352707 + ... + 352714.

2^2821684 is an apocalyptic number.

It is an amenable number.

2821684 is a deficient number, since it is larger than the sum of its proper divisors (2116270).

2821684 is a wasteful number, since it uses less digits than its factorization.

2821684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705425 (or 705423 counting only the distinct ones).

The product of its digits is 6144, while the sum is 31.

The square root of 2821684 is about 1679.7868912454. The cubic root of 2821684 is about 141.3088813954.

It can be divided in two parts, 28 and 21684, that added together give a palindrome (21712).

The spelling of 2821684 in words is "two million, eight hundred twenty-one thousand, six hundred eighty-four".