3388721 has 8 divisors (see below), whose sum is σ = 3884160. Its totient is φ = 2896128.

The previous prime is 3388717. The next prime is 3388727. The reversal of 3388721 is 1278833.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3388721 - 2² = 3388717 is a prime.

It is a super-2 number, since 2×3388721² = 22966860031682, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3388727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3620 + ... + 4458.

It is an arithmetic number, because the mean of its divisors is an integer number (485520).

Almost surely, 2^3388721 is an apocalyptic number.

It is an amenable number.

3388721 is a deficient number, since it is larger than the sum of its proper divisors (495439).

3388721 is an equidigital number, since it uses as much as digits as its factorization.

3388721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423.

The product of its digits is 8064, while the sum is 32.

The square root of 3388721 is about 1840.8479024623. The cubic root of 3388721 is about 150.2029992256.

The spelling of 3388721 in words is "three million, three hundred eighty-eight thousand, seven hundred twenty-one".