3493781 has 2 divisors, whose sum is σ = 3493782. Its totient is φ = 3493780.

The previous prime is 3493759. The next prime is 3493783. The reversal of 3493781 is 1873943.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2907025 + 586756 = 1705^2 + 766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3493781 is a prime.

It is a super-2 number, since 2×3493781² = 24413011351922, which contains 22 as substring.

Together with 3493783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3493783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1746890 + 1746891.

It is an arithmetic number, because the mean of its divisors is an integer number (1746891).

Almost surely, 2^3493781 is an apocalyptic number.

It is an amenable number.

3493781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3493781 is an equidigital number, since it uses as much as digits as its factorization.

3493781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 3493781 is about 1869.1658567393. The cubic root of 3493781 is about 151.7394688656.

The spelling of 3493781 in words is "three million, four hundred ninety-three thousand, seven hundred eighty-one".