123398681 has 8 divisors (see below), whose sum is σ = 143688384. Its totient is φ = 103774320.

The previous prime is 123398659. The next prime is 123398687. The reversal of 123398681 is 186893321.

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 123398681 - 2⁶ = 123398617 is a prime.

It is a super-2 number, since 2×123398681² = 30454468945079522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123398687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165935 + ... + 166676.

It is an arithmetic number, because the mean of its divisors is an integer number (17961048).

Almost surely, 2^123398681 is an apocalyptic number.

It is an amenable number.

123398681 is a deficient number, since it is larger than the sum of its proper divisors (20289703).

123398681 is an equidigital number, since it uses as much as digits as its factorization.

123398681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332671.

The product of its digits is 62208, while the sum is 41.

The square root of 123398681 is about 11108.4958927840. The cubic root of 123398681 is about 497.8557253178.

The spelling of 123398681 in words is "one hundred twenty-three million, three hundred ninety-eight thousand, six hundred eighty-one".