3321813 has 12 divisors (see below), whose sum is σ = 4868864. Its totient is φ = 2013000.

The previous prime is 3321781. The next prime is 3321841. The reversal of 3321813 is 3181233.

It is a happy number.

It is not a de Polignac number, because 3321813 - 2⁵ = 3321781 is a prime.

It is a super-3 number, since 3×3321813³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

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 3321813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3321113) 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, 4213 + ... + 4938.

Almost surely, 2^3321813 is an apocalyptic number.

3321813 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

3321813 is a deficient number, since it is larger than the sum of its proper divisors (1547051).

3321813 is a wasteful number, since it uses less digits than its factorization.

3321813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9176 (or 9165 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

The square root of 3321813 is about 1822.5841544357. The cubic root of 3321813 is about 149.2078686609.

It can be divided in two parts, 332 and 1813, that added together give a triangular number (2145 = T₆₅).

The spelling of 3321813 in words is "three million, three hundred twenty-one thousand, eight hundred thirteen".