3784381 has 2 divisors, whose sum is σ = 3784382. Its totient is φ = 3784380.

The previous prime is 3784373. The next prime is 3784399. The reversal of 3784381 is 1834873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3767481 + 16900 = 1941^2 + 130^2 .

It is a cyclic number.

It is not a de Polignac number, because 3784381 - 2³ = 3784373 is a prime.

It is a super-2 number, since 2×3784381² = 28643079106322, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3784321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1892190 + 1892191.

It is an arithmetic number, because the mean of its divisors is an integer number (1892191).

Almost surely, 2^3784381 is an apocalyptic number.

It is an amenable number.

3784381 is a deficient number, since it is larger than the sum of its proper divisors (1).

3784381 is an equidigital number, since it uses as much as digits as its factorization.

3784381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 3784381 is about 1945.3485548868. The cubic root of 3784381 is about 155.8349805527.

The spelling of 3784381 in words is "three million, seven hundred eighty-four thousand, three hundred eighty-one".