3668121 has 18 divisors (see below), whose sum is σ = 5596890. Its totient is φ = 2314656.

The previous prime is 3668117. The next prime is 3668129. The reversal of 3668121 is 1218663.

It can be written as a sum of positive squares in only one way, i.e., 2368521 + 1299600 = 1539^2 + 1140^2 .

It is not a de Polignac number, because 3668121 - 2² = 3668117 is a prime.

It is a super-2 number, since 2×3668121² = 26910223341282, which contains 22 as substring.

3668121 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3668129) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2685 + ... + 3813.

Almost surely, 2^3668121 is an apocalyptic number.

It is an amenable number.

3668121 is a deficient number, since it is larger than the sum of its proper divisors (1928769).

3668121 is a wasteful number, since it uses less digits than its factorization.

3668121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173 (or 1151 counting only the distinct ones).

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

The square root of 3668121 is about 1915.2339282709. The cubic root of 3668121 is about 154.2225516735. Note that the first 3 decimals are identical.

It can be divided in two parts, 36 and 68121, that multiplied together give a square (2452356 = 1566²).

The spelling of 3668121 in words is "three million, six hundred sixty-eight thousand, one hundred twenty-one".