123135638 has 8 divisors (see below), whose sum is σ = 185641632. Its totient is φ = 61255096.

The previous prime is 123135619. The next prime is 123135647. The reversal of 123135638 is 836531321.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155870 + ... + 156657.

It is an arithmetic number, because the mean of its divisors is an integer number (23205204).

Almost surely, 2^123135638 is an apocalyptic number.

123135638 is a deficient number, since it is larger than the sum of its proper divisors (62505994).

123135638 is a wasteful number, since it uses less digits than its factorization.

123135638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312726.

The product of its digits is 12960, while the sum is 32.

The square root of 123135638 is about 11096.6498547985. The cubic root of 123135638 is about 497.5017220044.

Adding to 123135638 its reverse (836531321), we get a palindrome (959666959).

The spelling of 123135638 in words is "one hundred twenty-three million, one hundred thirty-five thousand, six hundred thirty-eight".