123019506 has 16 divisors (see below), whose sum is σ = 273376800. Its totient is φ = 41006484.

The previous prime is 123019489. The next prime is 123019513. The reversal of 123019506 is 605910321.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 123019506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1139016 + ... + 1139123.

It is an arithmetic number, because the mean of its divisors is an integer number (17086050).

Almost surely, 2^123019506 is an apocalyptic number.

123019506 is an abundant number, since it is smaller than the sum of its proper divisors (150357294).

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

123019506 is a wasteful number, since it uses less digits than its factorization.

123019506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2278150 (or 2278144 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 123019506 is about 11091.4158699419. The cubic root of 123019506 is about 497.3452711083.

Adding to 123019506 its reverse (605910321), we get a palindrome (728929827).

It can be divided in two parts, 1230 and 19506, that added together give a 4-th power (20736 = 12⁴).

The spelling of 123019506 in words is "one hundred twenty-three million, nineteen thousand, five hundred six".