2821642 has 8 divisors (see below), whose sum is σ = 4378500. Its totient is φ = 1362144.

The previous prime is 2821627. The next prime is 2821649. The reversal of 2821642 is 2461282.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2819041 + 2601 = 1679^2 + 51^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2821649) 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, 24267 + ... + 24382.

2^2821642 is an apocalyptic number.

2821642 is a deficient number, since it is larger than the sum of its proper divisors (1556858).

2821642 is a wasteful number, since it uses less digits than its factorization.

2821642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48680.

The product of its digits is 1536, while the sum is 25.

The square root of 2821642 is about 1679.7743896131. The cubic root of 2821642 is about 141.3081802772.

The spelling of 2821642 in words is "two million, eight hundred twenty-one thousand, six hundred forty-two".