1949881 has 2 divisors, whose sum is σ = 1949882. Its totient is φ = 1949880.

The previous prime is 1949839. The next prime is 1949887. The reversal of 1949881 is 1889491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1123600 + 826281 = 1060^2 + 909^2 .

It is an emirp because it is prime and its reverse (1889491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1949881 is a prime.

It is a super-2 number, since 2×1949881² = 7604071828322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1949887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974940 + 974941.

It is an arithmetic number, because the mean of its divisors is an integer number (974941).

2^1949881 is an apocalyptic number.

It is an amenable number.

1949881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949881 is an equidigital number, since it uses as much as digits as its factorization.

1949881 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1949881 is about 1396.3813948918. The cubic root of 1949881 is about 124.9307563162.

The spelling of 1949881 in words is "one million, nine hundred forty-nine thousand, eight hundred eighty-one".