123781667 has 8 divisors (see below), whose sum is σ = 128073600. Its totient is φ = 119508480.

The previous prime is 123781643. The next prime is 123781681. The reversal of 123781667 is 766187321.

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 123781667 - 2¹⁸ = 123519523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123780667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9473 + ... + 18365.

It is an arithmetic number, because the mean of its divisors is an integer number (16009200).

Almost surely, 2^123781667 is an apocalyptic number.

123781667 is a deficient number, since it is larger than the sum of its proper divisors (4291933).

123781667 is an equidigital number, since it uses as much as digits as its factorization.

123781667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9373.

The product of its digits is 84672, while the sum is 41.

The square root of 123781667 is about 11125.7209654026. The cubic root of 123781667 is about 498.3702495989.

The spelling of 123781667 in words is "one hundred twenty-three million, seven hundred eighty-one thousand, six hundred sixty-seven".