123987534 has 64 divisors (see below), whose sum is σ = 277385472. Its totient is φ = 36633600.

The previous prime is 123987529. The next prime is 123987553. The reversal of 123987534 is 435789321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 684924 + ... + 685104.

It is an arithmetic number, because the mean of its divisors is an integer number (4334148).

Almost surely, 2^123987534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123987534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138692736).

123987534 is an abundant number, since it is smaller than the sum of its proper divisors (153397938).

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

123987534 is a wasteful number, since it uses less digits than its factorization.

123987534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401.

The product of its digits is 181440, while the sum is 42.

The square root of 123987534 is about 11134.9689716676. The cubic root of 123987534 is about 498.6463840882.

The spelling of 123987534 in words is "one hundred twenty-three million, nine hundred eighty-seven thousand, five hundred thirty-four".