124478639 has 2 divisors, whose sum is σ = 124478640. Its totient is φ = 124478638.

The previous prime is 124478621. The next prime is 124478663. The reversal of 124478639 is 936874421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 124478639 - 2²⁰ = 123430063 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 124478639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124478239) 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 as a sum of consecutive naturals, namely, 62239319 + 62239320.

It is an arithmetic number, because the mean of its divisors is an integer number (62239320).

Almost surely, 2^124478639 is an apocalyptic number.

124478639 is a deficient number, since it is larger than the sum of its proper divisors (1).

124478639 is an equidigital number, since it uses as much as digits as its factorization.

124478639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 44.

The square root of 124478639 is about 11156.9995518508. Note that the first 3 decimals coincide. The cubic root of 124478639 is about 499.3038832928.

The spelling of 124478639 in words is "one hundred twenty-four million, four hundred seventy-eight thousand, six hundred thirty-nine".