3706621 has 2 divisors, whose sum is σ = 3706622. Its totient is φ = 3706620.

The previous prime is 3706609. The next prime is 3706627. The reversal of 3706621 is 1266073.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3290596 + 416025 = 1814^2 + 645^2 .

It is an emirp because it is prime and its reverse (1266073) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3706621 - 2¹¹ = 3704573 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3706627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1853310 + 1853311.

It is an arithmetic number, because the mean of its divisors is an integer number (1853311).

Almost surely, 2^3706621 is an apocalyptic number.

It is an amenable number.

3706621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3706621 is an equidigital number, since it uses as much as digits as its factorization.

3706621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 3706621 is about 1925.2586839176. The cubic root of 3706621 is about 154.7602397957.

The spelling of 3706621 in words is "three million, seven hundred six thousand, six hundred twenty-one".