3492821 has 4 divisors (see below), whose sum is σ = 3496812. Its totient is φ = 3488832.

The previous prime is 3492793. The next prime is 3492823. The reversal of 3492821 is 1282943.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2788900 + 703921 = 1670^2 + 839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3492821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3492823) 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 3 ways as a sum of consecutive naturals, for example, 50 + ... + 2643.

It is an arithmetic number, because the mean of its divisors is an integer number (874203).

Almost surely, 2^3492821 is an apocalyptic number.

It is an amenable number.

3492821 is a deficient number, since it is larger than the sum of its proper divisors (3991).

3492821 is a wasteful number, since it uses less digits than its factorization.

3492821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3990.

The product of its digits is 3456, while the sum is 29.

The square root of 3492821 is about 1868.9090400552. The cubic root of 3492821 is about 151.7255695748.

The spelling of 3492821 in words is "three million, four hundred ninety-two thousand, eight hundred twenty-one".