123638245 has 8 divisors (see below), whose sum is σ = 149015160. Its totient is φ = 98477760.

The previous prime is 123638243. The next prime is 123638257. The reversal of 123638245 is 542836321.

It can be written as a sum of positive squares in 4 ways, for example, as 43678881 + 79959364 = 6609^2 + 8942^2 .

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

It is not a de Polignac number, because 123638245 - 2¹ = 123638243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123638245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123638243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52846 + ... + 55135.

It is an arithmetic number, because the mean of its divisors is an integer number (18626895).

Almost surely, 2^123638245 is an apocalyptic number.

It is an amenable number.

123638245 is a deficient number, since it is larger than the sum of its proper divisors (25376915).

123638245 is a wasteful number, since it uses less digits than its factorization.

123638245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108215.

The product of its digits is 34560, while the sum is 34.

The square root of 123638245 is about 11119.2735823884. The cubic root of 123638245 is about 498.1776931307.

The spelling of 123638245 in words is "one hundred twenty-three million, six hundred thirty-eight thousand, two hundred forty-five".