3778081 has 2 divisors, whose sum is σ = 3778082. Its totient is φ = 3778080.

The previous prime is 3778079. The next prime is 3778087. The reversal of 3778081 is 1808773.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3744225 + 33856 = 1935^2 + 184^2 .

It is an emirp because it is prime and its reverse (1808773) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3778081 - 2¹ = 3778079 is a prime.

It is a super-2 number, since 2×3778081² = 28547792085122, which contains 22 as substring.

Together with 3778079, it forms a pair of twin primes.

3778081 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (3778087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1889040 + 1889041.

It is an arithmetic number, because the mean of its divisors is an integer number (1889041).

Almost surely, 2^3778081 is an apocalyptic number.

It is an amenable number.

3778081 is a deficient number, since it is larger than the sum of its proper divisors (1).

3778081 is an equidigital number, since it uses as much as digits as its factorization.

3778081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 3778081 is about 1943.7286333231. The cubic root of 3778081 is about 155.7484577569.

Subtracting from 3778081 its product of nonzero digits (9408), we obtain a palindrome (3768673).

The spelling of 3778081 in words is "three million, seven hundred seventy-eight thousand, eighty-one".