123840420 has 48 divisors (see below), whose sum is σ = 378278208. Its totient is φ = 30021760.

The previous prime is 123840413. The next prime is 123840433. The reversal of 123840420 is 24048321.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93159 + ... + 94478.

It is an arithmetic number, because the mean of its divisors is an integer number (7880796).

Almost surely, 2^123840420 is an apocalyptic number.

123840420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123840420 is an abundant number, since it is smaller than the sum of its proper divisors (254437788).

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

123840420 is a wasteful number, since it uses less digits than its factorization.

123840420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187660 (or 187658 counting only the distinct ones).

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

The square root of 123840420 is about 11128.3610653142. The cubic root of 123840420 is about 498.4490876490.

Adding to 123840420 its reverse (24048321), we get a palindrome (147888741).

The spelling of 123840420 in words is "one hundred twenty-three million, eight hundred forty thousand, four hundred twenty".