138780051 has 8 divisors (see below), whose sum is σ = 191420880. Its totient is φ = 89329632.

The previous prime is 138779983. The next prime is 138780071. The reversal of 138780051 is 150087831.

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

It is not a de Polignac number, because 138780051 - 2¹³ = 138771859 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138779994 and 138780021.

It is not an unprimeable number, because it can be changed into a prime (138780071) by changing a digit.

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, 797500 + ... + 797673.

It is an arithmetic number, because the mean of its divisors is an integer number (23927610).

Almost surely, 2^138780051 is an apocalyptic number.

138780051 is a deficient number, since it is larger than the sum of its proper divisors (52640829).

138780051 is a wasteful number, since it uses less digits than its factorization.

138780051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595205.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 138780051 is about 11780.4945142384. The cubic root of 138780051 is about 517.7367751247.

The spelling of 138780051 in words is "one hundred thirty-eight million, seven hundred eighty thousand, fifty-one".