123968749 has 16 divisors (see below), whose sum is σ = 133721280. Its totient is φ = 114566400.

The previous prime is 123968731. The next prime is 123968753. The reversal of 123968749 is 947869321.

It is a cyclic number.

It is not a de Polignac number, because 123968749 - 2⁹ = 123968237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123968729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308949 + ... + 309349.

It is an arithmetic number, because the mean of its divisors is an integer number (8357580).

Almost surely, 2^123968749 is an apocalyptic number.

123968749 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

123968749 is a deficient number, since it is larger than the sum of its proper divisors (9752531).

123968749 is a wasteful number, since it uses less digits than its factorization.

123968749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780.

The product of its digits is 653184, while the sum is 49.

The square root of 123968749 is about 11134.1254259147. The cubic root of 123968749 is about 498.6211999827.

The spelling of 123968749 in words is "one hundred twenty-three million, nine hundred sixty-eight thousand, seven hundred forty-nine".