123780055 has 16 divisors (see below), whose sum is σ = 175233024. Its totient is φ = 82139040.

The previous prime is 123780049. The next prime is 123780067. The reversal of 123780055 is 550087321.

It is not a de Polignac number, because 123780055 - 2²³ = 115391447 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123779999 and 123780026.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55957 + ... + 58126.

It is an arithmetic number, because the mean of its divisors is an integer number (10952064).

Almost surely, 2^123780055 is an apocalyptic number.

123780055 is a deficient number, since it is larger than the sum of its proper divisors (51452969).

123780055 is a wasteful number, since it uses less digits than its factorization.

123780055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114126.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 123780055 is about 11125.6485204234. The cubic root of 123780055 is about 498.3680861759.

The spelling of 123780055 in words is "one hundred twenty-three million, seven hundred eighty thousand, fifty-five".