3390921 has 6 divisors (see below), whose sum is σ = 4898010. Its totient is φ = 2260608.

The previous prime is 3390901. The next prime is 3390931. The reversal of 3390921 is 1290933.

It can be written as a sum of positive squares in only one way, i.e., 1863225 + 1527696 = 1365^2 + 1236^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3390921 is a prime.

It is a super-2 number, since 2×3390921² = 22996690456482, which contains 22 as substring.

It is a Curzon number.

3390921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3390901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 188376 + ... + 188393.

It is an arithmetic number, because the mean of its divisors is an integer number (816335).

Almost surely, 2^3390921 is an apocalyptic number.

It is an amenable number.

3390921 is a deficient number, since it is larger than the sum of its proper divisors (1507089).

3390921 is a wasteful number, since it uses less digits than its factorization.

3390921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376775 (or 376772 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 3390921 is about 1841.4453562352. The cubic root of 3390921 is about 150.2354967484.

It can be divided in two parts, 33909 and 21, that added together give a triangular number (33930 = T₂₆₀).

The spelling of 3390921 in words is "three million, three hundred ninety thousand, nine hundred twenty-one".