1938580081 has 8 divisors (see below), whose sum is σ = 2054341800. Its totient is φ = 1826079360.

The previous prime is 1938579997. The next prime is 1938580087. The reversal of 1938580081 is 1800858391.

It can be written as a sum of positive squares in 4 ways, for example, as 379456 + 1938200625 = 616^2 + 44025^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1938580081 - 2¹³ = 1938571889 is a prime.

It is a super-2 number, since 2×1938580081² = 7516185460899933122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1938580087) 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, 814026 + ... + 816403.

It is an arithmetic number, because the mean of its divisors is an integer number (256792725).

Almost surely, 2^1938580081 is an apocalyptic number.

It is an amenable number.

1938580081 is a deficient number, since it is larger than the sum of its proper divisors (115761719).

1938580081 is a wasteful number, since it uses less digits than its factorization.

1938580081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630499.

The product of its (nonzero) digits is 69120, while the sum is 43.

The square root of 1938580081 is about 44029.3093404836. The cubic root of 1938580081 is about 1246.8893494503.

The spelling of 1938580081 in words is "one billion, nine hundred thirty-eight million, five hundred eighty thousand, eighty-one".