3681749 has 2 divisors, whose sum is σ = 3681750. Its totient is φ = 3681748.

The previous prime is 3681731. The next prime is 3681761. The reversal of 3681749 is 9471863.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3678724 + 3025 = 1918^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 3681749 - 2²⁰ = 2633173 is a prime.

It is a Chen 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 (3681709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1840874 + 1840875.

It is an arithmetic number, because the mean of its divisors is an integer number (1840875).

Almost surely, 2^3681749 is an apocalyptic number.

It is an amenable number.

3681749 is a deficient number, since it is larger than the sum of its proper divisors (1).

3681749 is an equidigital number, since it uses as much as digits as its factorization.

3681749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 3681749 is about 1918.7884198108. The cubic root of 3681749 is about 154.4133075995.

The spelling of 3681749 in words is "three million, six hundred eighty-one thousand, seven hundred forty-nine".