123040428 has 48 divisors (see below), whose sum is σ = 345381120. Its totient is φ = 33303744.

The previous prime is 123040427. The next prime is 123040433. The reversal of 123040428 is 824040321.

It is a junction number, because it is equal to n+sod(n) for n = 123040398 and 123040407.

It is not an unprimeable number, because it can be changed into a prime (123040427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36951 + ... + 40142.

It is an arithmetic number, because the mean of its divisors is an integer number (7195440).

Almost surely, 2^123040428 is an apocalyptic number.

It is an amenable number.

123040428 is an abundant number, since it is smaller than the sum of its proper divisors (222340692).

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

123040428 is a wasteful number, since it uses less digits than its factorization.

123040428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77126 (or 77124 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 123040428 is about 11092.3589916663. The cubic root of 123040428 is about 497.3734641113.

Adding to 123040428 its reverse (824040321), we get a palindrome (947080749).

The spelling of 123040428 in words is "one hundred twenty-three million, forty thousand, four hundred twenty-eight".