3470821 has 2 divisors, whose sum is σ = 3470822. Its totient is φ = 3470820.

The previous prime is 3470743. The next prime is 3470827. The reversal of 3470821 is 1280743.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3062500 + 408321 = 1750^2 + 639^2 .

It is an emirp because it is prime and its reverse (1280743) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3470821 - 2¹⁹ = 2946533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3470827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1735410 + 1735411.

It is an arithmetic number, because the mean of its divisors is an integer number (1735411).

Almost surely, 2^3470821 is an apocalyptic number.

It is an amenable number.

3470821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3470821 is an equidigital number, since it uses as much as digits as its factorization.

3470821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 3470821 is about 1863.0139559327. The cubic root of 3470821 is about 151.4063438106.

The spelling of 3470821 in words is "three million, four hundred seventy thousand, eight hundred twenty-one".