780138 has 16 divisors (see below), whose sum is σ = 1733760. Its totient is φ = 260028.

The previous prime is 780127. The next prime is 780163. The reversal of 780138 is 831087.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7170 + ... + 7277.

It is an arithmetic number, because the mean of its divisors is an integer number (108360).

2⁷⁸⁰¹³⁸ is an apocalyptic number.

780138 is an abundant number, since it is smaller than the sum of its proper divisors (953622).

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

780138 is a wasteful number, since it uses less digits than its factorization.

780138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14458 (or 14452 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 780138 is about 883.2542102928. The cubic root of 780138 is about 92.0570691915.

The spelling of 780138 in words is "seven hundred eighty thousand, one hundred thirty-eight".