3318921 has 16 divisors (see below), whose sum is σ = 4979520. Its totient is φ = 2184480.

The previous prime is 3318919. The next prime is 3318929. The reversal of 3318921 is 1298133.

It is not a de Polignac number, because 3318921 - 2¹ = 3318919 is a prime.

It is a super-2 number, since 2×3318921² = 22030473208482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3318929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1501 + ... + 2981.

It is an arithmetic number, because the mean of its divisors is an integer number (311220).

Almost surely, 2^3318921 is an apocalyptic number.

It is an amenable number.

3318921 is a deficient number, since it is larger than the sum of its proper divisors (1660599).

3318921 is a wasteful number, since it uses less digits than its factorization.

3318921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573 (or 1567 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 3318921 is about 1821.7906026764. The cubic root of 3318921 is about 149.1645555222.

The spelling of 3318921 in words is "three million, three hundred eighteen thousand, nine hundred twenty-one".