381949 has 2 divisors, whose sum is σ = 381950. Its totient is φ = 381948.

The previous prime is 381943. The next prime is 381977. The reversal of 381949 is 949183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 381924 + 25 = 618^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 381949 - 2⁵ = 381917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190974 + 190975.

It is an arithmetic number, because the mean of its divisors is an integer number (190975).

2³⁸¹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

381949 is a deficient number, since it is larger than the sum of its proper divisors (1).

381949 is an equidigital number, since it uses as much as digits as its factorization.

381949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 34.

The square root of 381949 is about 618.0202262062. The cubic root of 381949 is about 72.5551858860. Note that the first 3 decimals are identical.

The spelling of 381949 in words is "three hundred eighty-one thousand, nine hundred forty-nine".