3689281 has 2 divisors, whose sum is σ = 3689282. Its totient is φ = 3689280.

The previous prime is 3689263. The next prime is 3689291. The reversal of 3689281 is 1829863.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3671056 + 18225 = 1916^2 + 135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3689281 is a prime.

It is a super-2 number, since 2×3689281² = 27221588593922, which contains 22 as substring.

3689281 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3689281.

It is not a weakly prime, because it can be changed into another prime (3689291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1844640 + 1844641.

It is an arithmetic number, because the mean of its divisors is an integer number (1844641).

Almost surely, 2^3689281 is an apocalyptic number.

It is an amenable number.

3689281 is a deficient number, since it is larger than the sum of its proper divisors (1).

3689281 is an equidigital number, since it uses as much as digits as its factorization.

3689281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 3689281 is about 1920.7501138878. The cubic root of 3689281 is about 154.5185337506.

The spelling of 3689281 in words is "three million, six hundred eighty-nine thousand, two hundred eighty-one".