3670721 has 2 divisors, whose sum is σ = 3670722. Its totient is φ = 3670720.

The previous prime is 3670717. The next prime is 3670739. The reversal of 3670721 is 1270763.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3568321 + 102400 = 1889^2 + 320^2 .

It is a cyclic number.

It is not a de Polignac number, because 3670721 - 2² = 3670717 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3670321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1835360 + 1835361.

It is an arithmetic number, because the mean of its divisors is an integer number (1835361).

Almost surely, 2^3670721 is an apocalyptic number.

It is an amenable number.

3670721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3670721 is an equidigital number, since it uses as much as digits as its factorization.

3670721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 3670721 is about 1915.9125762936. The cubic root of 3670721 is about 154.2589812181.

Subtracting from 3670721 its sum of digits (26), we obtain a triangular number (3670695 = T₂₇₀₉).

The spelling of 3670721 in words is "three million, six hundred seventy thousand, seven hundred twenty-one".