123121572 has 48 divisors (see below), whose sum is σ = 328903680. Its totient is φ = 35115552.

The previous prime is 123121549. The next prime is 123121601. The reversal of 123121572 is 275121321.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69603 + ... + 71349.

It is an arithmetic number, because the mean of its divisors is an integer number (6852160).

Almost surely, 2^123121572 is an apocalyptic number.

123121572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123121572 is an abundant number, since it is smaller than the sum of its proper divisors (205782108).

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

123121572 is a wasteful number, since it uses less digits than its factorization.

123121572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2600 (or 2598 counting only the distinct ones).

The product of its digits is 840, while the sum is 24.

The square root of 123121572 is about 11096.0160418053. The cubic root of 123121572 is about 497.4827777848.

Adding to 123121572 its reverse (275121321), we get a palindrome (398242893).

The spelling of 123121572 in words is "one hundred twenty-three million, one hundred twenty-one thousand, five hundred seventy-two".