123921534 has 64 divisors (see below), whose sum is σ = 301397760. Its totient is φ = 33477120.

The previous prime is 123921527. The next prime is 123921559. The reversal of 123921534 is 435129321.

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, 18412 + ... + 24224.

It is an arithmetic number, because the mean of its divisors is an integer number (4709340).

Almost surely, 2^123921534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123921534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150698880).

123921534 is an abundant number, since it is smaller than the sum of its proper divisors (177476226).

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

123921534 is a wasteful number, since it uses less digits than its factorization.

123921534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5865.

The product of its digits is 6480, while the sum is 30.

The square root of 123921534 is about 11132.0049407104. The cubic root of 123921534 is about 498.5578899695.

The spelling of 123921534 in words is "one hundred twenty-three million, nine hundred twenty-one thousand, five hundred thirty-four".