123528987 has 12 divisors (see below), whose sum is σ = 188926920. Its totient is φ = 77508288.

The previous prime is 123528973. The next prime is 123528989. The reversal of 123528987 is 789825321.

It is a happy number.

It is not a de Polignac number, because 123528987 - 2⁴ = 123528971 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (123528989) 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 11 ways as a sum of consecutive naturals, for example, 403537 + ... + 403842.

It is an arithmetic number, because the mean of its divisors is an integer number (15743910).

Almost surely, 2^123528987 is an apocalyptic number.

123528987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

123528987 is a deficient number, since it is larger than the sum of its proper divisors (65397933).

123528987 is a wasteful number, since it uses less digits than its factorization.

123528987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807402 (or 807399 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 123528987 is about 11114.3594957154. The cubic root of 123528987 is about 498.0309048416.

The spelling of 123528987 in words is "one hundred twenty-three million, five hundred twenty-eight thousand, nine hundred eighty-seven".