3490821 has 12 divisors (see below), whose sum is σ = 5060172. Its totient is φ = 2318976.

The previous prime is 3490819. The next prime is 3490829. The reversal of 3490821 is 1280943.

It can be written as a sum of positive squares in 2 ways, for example, as 2873025 + 617796 = 1695^2 + 786^2 .

It is not a de Polignac number, because 3490821 - 2¹ = 3490819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3490829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3085 + ... + 4061.

It is an arithmetic number, because the mean of its divisors is an integer number (421681).

Almost surely, 2^3490821 is an apocalyptic number.

It is an amenable number.

3490821 is a deficient number, since it is larger than the sum of its proper divisors (1569351).

3490821 is a wasteful number, since it uses less digits than its factorization.

3490821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380 (or 1377 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 3490821 is about 1868.3738919178. The cubic root of 3490821 is about 151.6966045370.

The spelling of 3490821 in words is "three million, four hundred ninety thousand, eight hundred twenty-one".