123878019 has 4 divisors (see below), whose sum is σ = 165170696. Its totient is φ = 82585344.

The previous prime is 123878011. The next prime is 123878047. The reversal of 123878019 is 910878321.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 123878019 - 2³ = 123878011 is a prime.

It is a super-2 number, since 2×123878019² = 30691527182728722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123878011) 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 3 ways as a sum of consecutive naturals, for example, 20646334 + ... + 20646339.

It is an arithmetic number, because the mean of its divisors is an integer number (41292674).

Almost surely, 2^123878019 is an apocalyptic number.

123878019 is a deficient number, since it is larger than the sum of its proper divisors (41292677).

123878019 is an equidigital number, since it uses as much as digits as its factorization.

123878019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41292676.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 123878019 is about 11130.0502694283. The cubic root of 123878019 is about 498.4995269991.

The spelling of 123878019 in words is "one hundred twenty-three million, eight hundred seventy-eight thousand, nineteen".