2406721 has 2 divisors, whose sum is σ = 2406722. Its totient is φ = 2406720.

The previous prime is 2406709. The next prime is 2406727. The reversal of 2406721 is 1276042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2002225 + 404496 = 1415^2 + 636^2 .

It is a cyclic number.

It is not a de Polignac number, because 2406721 - 2⁵ = 2406689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2406692 and 2406701.

It is not a weakly prime, because it can be changed into another prime (2406727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1203360 + 1203361.

It is an arithmetic number, because the mean of its divisors is an integer number (1203361).

2^2406721 is an apocalyptic number.

It is an amenable number.

2406721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2406721 is an equidigital number, since it uses as much as digits as its factorization.

2406721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 2406721 is about 1551.3610153668. The cubic root of 2406721 is about 134.0114529455.

The spelling of 2406721 in words is "two million, four hundred six thousand, seven hundred twenty-one".