3456781 has 2 divisors, whose sum is σ = 3456782. Its totient is φ = 3456780.

The previous prime is 3456767. The next prime is 3456793. The reversal of 3456781 is 1876543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3455881 + 900 = 1859^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 3456781 - 2⁵ = 3456749 is a prime.

It is a super-2 number, since 2×3456781² = 23898669763922, which contains 22 as substring.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3456721) 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, 1728390 + 1728391.

It is an arithmetic number, because the mean of its divisors is an integer number (1728391).

Almost surely, 2^3456781 is an apocalyptic number.

It is an amenable number.

3456781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3456781 is an equidigital number, since it uses as much as digits as its factorization.

3456781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 3456781 is about 1859.2420498687. The cubic root of 3456781 is about 151.2019139993.

The spelling of 3456781 in words is "three million, four hundred fifty-six thousand, seven hundred eighty-one".