123420136 has 32 divisors (see below), whose sum is σ = 280031040. Its totient is φ = 49782528.

The previous prime is 123420071. The next prime is 123420137. The reversal of 123420136 is 631024321.

It is not an unprimeable number, because it can be changed into a prime (123420137) 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 7 ways as a sum of consecutive naturals, for example, 63870 + ... + 65773.

It is an arithmetic number, because the mean of its divisors is an integer number (8750970).

Almost surely, 2^123420136 is an apocalyptic number.

It is an amenable number.

123420136 is an abundant number, since it is smaller than the sum of its proper divisors (156610904).

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

123420136 is a wasteful number, since it uses less digits than its factorization.

123420136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129673 (or 129669 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 123420136 is about 11109.4615531087. The cubic root of 123420136 is about 497.8845772620.

Adding to 123420136 its reverse (631024321), we get a palindrome (754444457).

The spelling of 123420136 in words is "one hundred twenty-three million, four hundred twenty thousand, one hundred thirty-six".