3400821 has 12 divisors (see below), whose sum is σ = 4942080. Its totient is φ = 2253480.

The previous prime is 3400739. The next prime is 3400823. The reversal of 3400821 is 1280043.

It is a happy number.

It is not a de Polignac number, because 3400821 - 2⁷ = 3400693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3400794 and 3400803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3400823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 556 + ... + 2666.

It is an arithmetic number, because the mean of its divisors is an integer number (411840).

Almost surely, 2^3400821 is an apocalyptic number.

It is an amenable number.

3400821 is a deficient number, since it is larger than the sum of its proper divisors (1541259).

3400821 is a wasteful number, since it uses less digits than its factorization.

3400821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2296 (or 2293 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 3400821 is about 1844.1315029032. The cubic root of 3400821 is about 150.3815619137.

Adding to 3400821 its reverse (1280043), we get a palindrome (4680864).

The spelling of 3400821 in words is "three million, four hundred thousand, eight hundred twenty-one".