123878591 has 8 divisors (see below), whose sum is σ = 125829600. Its totient is φ = 121934592.

The previous prime is 123878567. The next prime is 123878593. The reversal of 123878591 is 195878321.

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

It is a cyclic number.

It is not a de Polignac number, because 123878591 - 2⁶ = 123878527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123878593) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 42311 + ... + 45143.

It is an arithmetic number, because the mean of its divisors is an integer number (15728700).

Almost surely, 2^123878591 is an apocalyptic number.

123878591 is a deficient number, since it is larger than the sum of its proper divisors (1951009).

123878591 is an equidigital number, since it uses as much as digits as its factorization.

123878591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3505.

The product of its digits is 120960, while the sum is 44.

The square root of 123878591 is about 11130.0759655988. The cubic root of 123878591 is about 498.5002942628.

The spelling of 123878591 in words is "one hundred twenty-three million, eight hundred seventy-eight thousand, five hundred ninety-one".