1802780138 has 8 divisors (see below), whose sum is σ = 2791401600. Its totient is φ = 872312940.

The previous prime is 1802780131. The next prime is 1802780143. The reversal of 1802780138 is 8310872081.

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

It is not an unprimeable number, because it can be changed into a prime (1802780131) 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 3 ways as a sum of consecutive naturals, for example, 14538488 + ... + 14538611.

It is an arithmetic number, because the mean of its divisors is an integer number (348925200).

Almost surely, 2^1802780138 is an apocalyptic number.

1802780138 is a deficient number, since it is larger than the sum of its proper divisors (988621462).

1802780138 is a wasteful number, since it uses less digits than its factorization.

1802780138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29077132.

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 1802780138 is about 42459.1584702288. The cubic root of 1802780138 is about 1217.0663495862.

The spelling of 1802780138 in words is "one billion, eight hundred two million, seven hundred eighty thousand, one hundred thirty-eight".