1881042640 has 40 divisors (see below), whose sum is σ = 4392564840. Its totient is φ = 749124096.

The previous prime is 1881042637. The next prime is 1881042641. The reversal of 1881042640 is 462401881.

It can be written as a sum of positive squares in 4 ways, for example, as 390773824 + 1490268816 = 19768^2 + 38604^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1881042596 and 1881042605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881042641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33019 + ... + 69658.

It is an arithmetic number, because the mean of its divisors is an integer number (109814121).

Almost surely, 2^1881042640 is an apocalyptic number.

1881042640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1881042640 is an abundant number, since it is smaller than the sum of its proper divisors (2511522200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1881042640 is a wasteful number, since it uses less digits than its factorization.

1881042640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102919 (or 102913 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 1881042640 is about 43370.9884600294. The cubic root of 1881042640 is about 1234.4292772929.

The spelling of 1881042640 in words is "one billion, eight hundred eighty-one million, forty-two thousand, six hundred forty".