123993989 has 16 divisors (see below), whose sum is σ = 149022720. Its totient is φ = 100866480.

The previous prime is 123993973. The next prime is 123993997. The reversal of 123993989 is 989399321.

It is a cyclic number.

It is not a de Polignac number, because 123993989 - 2⁴ = 123993973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123993989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123993929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18152 + ... + 24030.

It is an arithmetic number, because the mean of its divisors is an integer number (9313920).

Almost surely, 2^123993989 is an apocalyptic number.

It is an amenable number.

123993989 is a deficient number, since it is larger than the sum of its proper divisors (25028731).

123993989 is a wasteful number, since it uses less digits than its factorization.

123993989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6040.

The product of its digits is 944784, while the sum is 53.

The square root of 123993989 is about 11135.2588205214. The cubic root of 123993989 is about 498.6550373951.

The spelling of 123993989 in words is "one hundred twenty-three million, nine hundred ninety-three thousand, nine hundred eighty-nine".