1942781889 has 16 divisors (see below), whose sum is σ = 2607878592. Its totient is φ = 1286459328.

The previous prime is 1942781851. The next prime is 1942781921. The reversal of 1942781889 is 9881872491.

It is not a de Polignac number, because 1942781889 - 2²¹ = 1940684737 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1942781689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 401247 + ... + 406059.

It is an arithmetic number, because the mean of its divisors is an integer number (162992412).

Almost surely, 2^1942781889 is an apocalyptic number.

It is an amenable number.

1942781889 is a deficient number, since it is larger than the sum of its proper divisors (665096703).

1942781889 is a wasteful number, since it uses less digits than its factorization.

1942781889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5696.

The product of its digits is 2322432, while the sum is 57.

The square root of 1942781889 is about 44076.9995462486. Note that the first 3 decimals coincide. The cubic root of 1942781889 is about 1247.7895631325.

The spelling of 1942781889 in words is "one billion, nine hundred forty-two million, seven hundred eighty-one thousand, eight hundred eighty-nine".