123787138 has 8 divisors (see below), whose sum is σ = 192083580. Its totient is φ = 59759280.

The previous prime is 123787129. The next prime is 123787189. The reversal of 123787138 is 831787321.

It can be written as a sum of positive squares in 2 ways, for example, as 123498769 + 288369 = 11113^2 + 537^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 123787138.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1067073 + ... + 1067188.

Almost surely, 2^123787138 is an apocalyptic number.

123787138 is a deficient number, since it is larger than the sum of its proper divisors (68296442).

123787138 is a wasteful number, since it uses less digits than its factorization.

123787138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134292.

The product of its digits is 56448, while the sum is 40.

The square root of 123787138 is about 11125.9668343924. The cubic root of 123787138 is about 498.3775919449.

The spelling of 123787138 in words is "one hundred twenty-three million, seven hundred eighty-seven thousand, one hundred thirty-eight".