123989837 has 2 divisors, whose sum is σ = 123989838. Its totient is φ = 123989836.

The previous prime is 123989821. The next prime is 123989851. The reversal of 123989837 is 738989321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91795561 + 32194276 = 9581^2 + 5674^2 .

It is a cyclic number.

It is not a de Polignac number, because 123989837 - 2⁴ = 123989821 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123989867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61994918 + 61994919.

It is an arithmetic number, because the mean of its divisors is an integer number (61994919).

Almost surely, 2^123989837 is an apocalyptic number.

It is an amenable number.

123989837 is a deficient number, since it is larger than the sum of its proper divisors (1).

123989837 is an equidigital number, since it uses as much as digits as its factorization.

123989837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The square root of 123989837 is about 11135.0723841383. The cubic root of 123989837 is about 498.6494714295.

The spelling of 123989837 in words is "one hundred twenty-three million, nine hundred eighty-nine thousand, eight hundred thirty-seven".