3455821 has 2 divisors, whose sum is σ = 3455822. Its totient is φ = 3455820.

The previous prime is 3455801. The next prime is 3455827. The reversal of 3455821 is 1285543.

3455821 = 1314² + 1315².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1729225 + 1726596 = 1315^2 + 1314^2 .

It is a cyclic number.

It is not a de Polignac number, because 3455821 - 2¹¹ = 3453773 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3455821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3455827) 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 as a sum of consecutive naturals, namely, 1727910 + 1727911.

It is an arithmetic number, because the mean of its divisors is an integer number (1727911).

Almost surely, 2^3455821 is an apocalyptic number.

3455821 is the 1315-th centered square number.

It is an amenable number.

3455821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3455821 is an equidigital number, since it uses as much as digits as its factorization.

3455821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 28.

The square root of 3455821 is about 1858.9838622215. The cubic root of 3455821 is about 151.1879156892.

It can be divided in two parts, 34 and 55821, that added together give a palindrome (55855).

The spelling of 3455821 in words is "three million, four hundred fifty-five thousand, eight hundred twenty-one".