123779655 has 24 divisors (see below), whose sum is σ = 214813248. Its totient is φ = 65935296.

The previous prime is 123779653. The next prime is 123779693. The reversal of 123779655 is 556977321.

It is not a de Polignac number, because 123779655 - 2¹ = 123779653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 123779655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123779653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63069 + ... + 65001.

It is an arithmetic number, because the mean of its divisors is an integer number (8950552).

Almost surely, 2^123779655 is an apocalyptic number.

123779655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123779655 is a deficient number, since it is larger than the sum of its proper divisors (91033593).

123779655 is a wasteful number, since it uses less digits than its factorization.

123779655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3367 (or 3364 counting only the distinct ones).

The product of its digits is 396900, while the sum is 45.

The square root of 123779655 is about 11125.6305439287. The cubic root of 123779655 is about 498.3675493435.

The spelling of 123779655 in words is "one hundred twenty-three million, seven hundred seventy-nine thousand, six hundred fifty-five".