123994417909 has 4 divisors (see below), whose sum is σ = 123995157804. Its totient is φ = 123993678016.

The previous prime is 123994417853. The next prime is 123994417919. The reversal of 123994417909 is 909714499321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 15549341809 + 108445076100 = 124697^2 + 329310^2 .

It is a cyclic number.

It is not a de Polignac number, because 123994417909 - 2²¹ = 123992320757 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123994417919) 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, 14829 + ... + 498205.

It is an arithmetic number, because the mean of its divisors is an integer number (30998789451).

Almost surely, 2^123994417909 is an apocalyptic number.

It is an amenable number.

123994417909 is a deficient number, since it is larger than the sum of its proper divisors (739895).

123994417909 is an equidigital number, since it uses as much as digits as its factorization.

123994417909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739894.

The product of its (nonzero) digits is 4408992, while the sum is 58.

The spelling of 123994417909 in words is "one hundred twenty-three billion, nine hundred ninety-four million, four hundred seventeen thousand, nine hundred nine".