123996981 has 8 divisors (see below), whose sum is σ = 165656160. Its totient is φ = 82501232.

The previous prime is 123996959. The next prime is 123996991. The reversal of 123996981 is 189699321.

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 123996981 - 2⁵ = 123996949 is a prime.

It is a super-2 number, since 2×123996981² = 30750502594228722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123996981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123996991) 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, 39075 + ... + 42128.

It is an arithmetic number, because the mean of its divisors is an integer number (20707020).

Almost surely, 2^123996981 is an apocalyptic number.

It is an amenable number.

123996981 is a deficient number, since it is larger than the sum of its proper divisors (41659179).

123996981 is an equidigital number, since it uses as much as digits as its factorization.

123996981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81715.

The product of its digits is 209952, while the sum is 48.

The square root of 123996981 is about 11135.3931677332. The cubic root of 123996981 is about 498.6590482451.

It can be divided in two parts, 12 and 3996981, that added together give a palindrome (3996993).

The spelling of 123996981 in words is "one hundred twenty-three million, nine hundred ninety-six thousand, nine hundred eighty-one".