123121432 has 16 divisors (see below), whose sum is σ = 263831760. Its totient is φ = 52766304.

The previous prime is 123121417. The next prime is 123121447. The reversal of 123121432 is 234121321.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (123121417) and next prime (123121447).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1099243 + ... + 1099354.

It is an arithmetic number, because the mean of its divisors is an integer number (16489485).

Almost surely, 2^123121432 is an apocalyptic number.

It is an amenable number.

123121432 is an abundant number, since it is smaller than the sum of its proper divisors (140710328).

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

123121432 is a wasteful number, since it uses less digits than its factorization.

123121432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198610 (or 2198606 counting only the distinct ones).

The product of its digits is 288, while the sum is 19.

The square root of 123121432 is about 11096.0097332329. The cubic root of 123121432 is about 497.4825892243.

Adding to 123121432 its reverse (234121321), we get a palindrome (357242753).

The spelling of 123121432 in words is "one hundred twenty-three million, one hundred twenty-one thousand, four hundred thirty-two".