1881918837 has 24 divisors (see below), whose sum is σ = 2836992600. Its totient is φ = 1200611328.

The previous prime is 1881918833. The next prime is 1881918839. The reversal of 1881918837 is 7388191881.

It can be written as a sum of positive squares in 4 ways, for example, as 141276996 + 1740641841 = 11886^2 + 41721^2 .

It is not a de Polignac number, because 1881918837 - 2² = 1881918833 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881918833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2412 + ... + 61397.

It is an arithmetic number, because the mean of its divisors is an integer number (118208025).

Almost surely, 2^1881918837 is an apocalyptic number.

It is an amenable number.

1881918837 is a deficient number, since it is larger than the sum of its proper divisors (955073763).

1881918837 is a wasteful number, since it uses less digits than its factorization.

1881918837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63957 (or 63954 counting only the distinct ones).

The product of its digits is 774144, while the sum is 54.

The square root of 1881918837 is about 43381.0884718215. The cubic root of 1881918837 is about 1234.6209148651.

The spelling of 1881918837 in words is "one billion, eight hundred eighty-one million, nine hundred eighteen thousand, eight hundred thirty-seven".