123369138 has 12 divisors (see below), whose sum is σ = 267299838. Its totient is φ = 41123040.

The previous prime is 123369133. The next prime is 123369149. The reversal of 123369138 is 831963321.

It can be written as a sum of positive squares in only one way, i.e., 107184609 + 16184529 = 10353^2 + 4023^2 .

It is not an unprimeable number, because it can be changed into a prime (123369133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3426903 + ... + 3426938.

Almost surely, 2^123369138 is an apocalyptic number.

123369138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

123369138 is an abundant number, since it is smaller than the sum of its proper divisors (143930700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123369138 is a wasteful number, since it uses less digits than its factorization.

123369138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6853849 (or 6853846 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 123369138 is about 11107.1660652031. The cubic root of 123369138 is about 497.8159914365.

The spelling of 123369138 in words is "one hundred twenty-three million, three hundred sixty-nine thousand, one hundred thirty-eight".