123478791 has 8 divisors (see below), whose sum is σ = 165159024. Its totient is φ = 82058880.

The previous prime is 123478783. The next prime is 123478793. The reversal of 123478791 is 197874321.

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

It is not a de Polignac number, because 123478791 - 2³ = 123478783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123478793) 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 7 ways as a sum of consecutive naturals, for example, 63970 + ... + 65871.

It is an arithmetic number, because the mean of its divisors is an integer number (20644878).

Almost surely, 2^123478791 is an apocalyptic number.

123478791 is a deficient number, since it is larger than the sum of its proper divisors (41680233).

123478791 is a wasteful number, since it uses less digits than its factorization.

123478791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130161.

The product of its digits is 84672, while the sum is 42.

The square root of 123478791 is about 11112.1011064515. The cubic root of 123478791 is about 497.9634374215.

The spelling of 123478791 in words is "one hundred twenty-three million, four hundred seventy-eight thousand, seven hundred ninety-one".