1481780138 has 8 divisors (see below), whose sum is σ = 2223231300. Its totient is φ = 740703040.

The previous prime is 1481780123. The next prime is 1481780141. The reversal of 1481780138 is 8310871841.

It can be written as a sum of positive squares in 2 ways, for example, as 1243479169 + 238300969 = 35263^2 + 15437^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1481780095 and 1481780104.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83393 + ... + 99588.

Almost surely, 2^1481780138 is an apocalyptic number.

1481780138 is a deficient number, since it is larger than the sum of its proper divisors (741451162).

1481780138 is a wasteful number, since it uses less digits than its factorization.

1481780138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187032.

The product of its (nonzero) digits is 43008, while the sum is 41.

The square root of 1481780138 is about 38493.8974124471. The cubic root of 1481780138 is about 1140.0605636235.

The spelling of 1481780138 in words is "one billion, four hundred eighty-one million, seven hundred eighty thousand, one hundred thirty-eight".