123400040 has 16 divisors (see below), whose sum is σ = 277650180. Its totient is φ = 49360000.

The previous prime is 123400027. The next prime is 123400049. The reversal of 123400040 is 40004321.

It can be written as a sum of positive squares in 2 ways, for example, as 103347556 + 20052484 = 10166^2 + 4478^2 .

It is a junction number, because it is equal to n+sod(n) for n = 123399988 and 123400024.

It is not an unprimeable number, because it can be changed into a prime (123400049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1542461 + ... + 1542540.

Almost surely, 2^123400040 is an apocalyptic number.

123400040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123400040 is an abundant number, since it is smaller than the sum of its proper divisors (154250140).

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

123400040 is a wasteful number, since it uses less digits than its factorization.

123400040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3085012 (or 3085008 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 123400040 is about 11108.5570620130. The cubic root of 123400040 is about 497.8575529533.

Adding to 123400040 its reverse (40004321), we get a palindrome (163404361).

The spelling of 123400040 in words is "one hundred twenty-three million, four hundred thousand, forty".