123129528 has 16 divisors (see below), whose sum is σ = 307823880. Its totient is φ = 41043168.

The previous prime is 123129527. The next prime is 123129541. The reversal of 123129528 is 825921321.

It is a happy number.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123129527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2565175 + ... + 2565222.

Almost surely, 2^123129528 is an apocalyptic number.

It is an amenable number.

123129528 is an abundant number, since it is smaller than the sum of its proper divisors (184694352).

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

123129528 is a wasteful number, since it uses less digits than its factorization.

123129528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130406 (or 5130402 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 123129528 is about 11096.3745430659. The cubic root of 123129528 is about 497.4934931769.

The spelling of 123129528 in words is "one hundred twenty-three million, one hundred twenty-nine thousand, five hundred twenty-eight".