123140240 has 20 divisors (see below), whose sum is σ = 286301244. Its totient is φ = 49256064.

The previous prime is 123140221. The next prime is 123140279. The reversal of 123140240 is 42041321.

It can be written as a sum of positive squares in 2 ways, for example, as 63170704 + 59969536 = 7948^2 + 7744^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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, 769547 + ... + 769706.

Almost surely, 2^123140240 is an apocalyptic number.

123140240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123140240 is an abundant number, since it is smaller than the sum of its proper divisors (163161004).

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

123140240 is a wasteful number, since it uses less digits than its factorization.

123140240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539266 (or 1539260 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 123140240 is about 11096.8572127427. The cubic root of 123140240 is about 497.5079197076.

Adding to 123140240 its reverse (42041321), we get a palindrome (165181561).

The spelling of 123140240 in words is "one hundred twenty-three million, one hundred forty thousand, two hundred forty".