123779378 has 6 divisors (see below), whose sum is σ = 185692671. Its totient is φ = 61881822.

The previous prime is 123779371. The next prime is 123779417. The reversal of 123779378 is 873977321.

It can be written as a sum of positive squares in only one way, i.e., 61889689 + 61889689 = 7867^2 + 7867^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=7867.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123779371) 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 2 ways as a sum of consecutive naturals, for example, 11801 + ... + 19667.

Almost surely, 2^123779378 is an apocalyptic number.

123779378 is a deficient number, since it is larger than the sum of its proper divisors (61913293).

123779378 is an frugal number, since it uses more digits than its factorization.

123779378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15736 (or 7869 counting only the distinct ones).

The product of its digits is 444528, while the sum is 47.

The square root of 123779378 is about 11125.6180951891. The cubic root of 123779378 is about 498.3671775863.

The spelling of 123779378 in words is "one hundred twenty-three million, seven hundred seventy-nine thousand, three hundred seventy-eight".