3919381 has 2 divisors, whose sum is σ = 3919382. Its totient is φ = 3919380.

The previous prime is 3919369. The next prime is 3919387. The reversal of 3919381 is 1839193.

3919381 is nontrivially palindromic in base 9.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3724900 + 194481 = 1930^2 + 441^2 .

It is a cyclic number.

It is not a de Polignac number, because 3919381 - 2⁹ = 3918869 is a prime.

It is a super-2 number, since 2×3919381² = 30723094846322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3919387) 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, 1959690 + 1959691.

It is an arithmetic number, because the mean of its divisors is an integer number (1959691).

Almost surely, 2^3919381 is an apocalyptic number.

It is an amenable number.

3919381 is a deficient number, since it is larger than the sum of its proper divisors (1).

3919381 is an equidigital number, since it uses as much as digits as its factorization.

3919381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 34.

The square root of 3919381 is about 1979.7426600445. The cubic root of 3919381 is about 157.6664034510. Note that the first 3 decimals are identical.

The spelling of 3919381 in words is "three million, nine hundred nineteen thousand, three hundred eighty-one".