2408821 has 4 divisors (see below), whose sum is σ = 2430252. Its totient is φ = 2387392.

The previous prime is 2408773. The next prime is 2408837. The reversal of 2408821 is 1288042.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1347921 + 1060900 = 1161^2 + 1030^2 .

It is a cyclic number.

It is not a de Polignac number, because 2408821 - 2⁹ = 2408309 is a prime.

It is a super-2 number, since 2×2408821² = 11604837220082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2406821) 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, 10546 + ... + 10771.

It is an arithmetic number, because the mean of its divisors is an integer number (607563).

2^2408821 is an apocalyptic number.

It is an amenable number.

2408821 is a deficient number, since it is larger than the sum of its proper divisors (21431).

2408821 is a wasteful number, since it uses less digits than its factorization.

2408821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21430.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 2408821 is about 1552.0376928413. The cubic root of 2408821 is about 134.0504191348.

The spelling of 2408821 in words is "two million, four hundred eight thousand, eight hundred twenty-one".