5406721 has 8 divisors (see below), whose sum is σ = 5522688. Its totient is φ = 5292000.

The previous prime is 5406719. The next prime is 5406733. The reversal of 5406721 is 1276045.

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 5406721 - 2¹ = 5406719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5406761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19101 + ... + 19381.

It is an arithmetic number, because the mean of its divisors is an integer number (690336).

It is a Proth number, since it is equal to 165 ⋅ 2¹⁵ + 1 and 165 < 2¹⁵.

Almost surely, 2^5406721 is an apocalyptic number.

It is an amenable number.

5406721 is a deficient number, since it is larger than the sum of its proper divisors (115967).

5406721 is a wasteful number, since it uses less digits than its factorization.

5406721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 5406721 is about 2325.2356869788. The cubic root of 5406721 is about 175.5138204986.

The spelling of 5406721 in words is "five million, four hundred six thousand, seven hundred twenty-one".