1881949 has 2 divisors, whose sum is σ = 1881950. Its totient is φ = 1881948.

The previous prime is 1881937. The next prime is 1881961. The reversal of 1881949 is 9491881.

It is a balanced prime because it is at equal distance from previous prime (1881937) and next prime (1881961).

It can be written as a sum of positive squares in only one way, i.e., 1249924 + 632025 = 1118^2 + 795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1881949 - 2⁷ = 1881821 is a prime.

1881949 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1881989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940974 + 940975.

It is an arithmetic number, because the mean of its divisors is an integer number (940975).

2^1881949 is an apocalyptic number.

It is an amenable number.

1881949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881949 is an equidigital number, since it uses as much as digits as its factorization.

1881949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 40.

The square root of 1881949 is about 1371.8414631436. The cubic root of 1881949 is about 123.4627510911.

The spelling of 1881949 in words is "one million, eight hundred eighty-one thousand, nine hundred forty-nine".