123784091 has 4 divisors (see below), whose sum is σ = 129166032. Its totient is φ = 118402152.

The previous prime is 123784081. The next prime is 123784099. The reversal of 123784091 is 190487321.

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

It is a cyclic number.

It is not a de Polignac number, because 123784091 - 2¹⁰ = 123783067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123784099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2690936 + ... + 2690981.

It is an arithmetic number, because the mean of its divisors is an integer number (32291508).

Almost surely, 2^123784091 is an apocalyptic number.

123784091 is a deficient number, since it is larger than the sum of its proper divisors (5381941).

123784091 is an equidigital number, since it uses as much as digits as its factorization.

123784091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5381940.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 123784091 is about 11125.8299016298. The cubic root of 123784091 is about 498.3735027506.

The spelling of 123784091 in words is "one hundred twenty-three million, seven hundred eighty-four thousand, ninety-one".