3880781 has 2 divisors, whose sum is σ = 3880782. Its totient is φ = 3880780.

The previous prime is 3880771. The next prime is 3880801. The reversal of 3880781 is 1870883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3865156 + 15625 = 1966^2 + 125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3880781 is a prime.

It is a super-2 number, since 2×3880781² = 30120922339922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3880771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1940390 + 1940391.

It is an arithmetic number, because the mean of its divisors is an integer number (1940391).

Almost surely, 2^3880781 is an apocalyptic number.

It is an amenable number.

3880781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3880781 is an equidigital number, since it uses as much as digits as its factorization.

3880781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 3880781 is about 1969.9697967228. The cubic root of 3880781 is about 157.1471027188.

The spelling of 3880781 in words is "three million, eight hundred eighty thousand, seven hundred eighty-one".