7123128 has 16 divisors (see below), whose sum is σ = 17807880. Its totient is φ = 2374368.

The previous prime is 7123117. The next prime is 7123159. The reversal of 7123128 is 8213217.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 296797 = 7123128 / (7 + 1 + 2 + 3 + 1 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 7123098 and 7123107.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148375 + ... + 148422.

Almost surely, 2^7123128 is an apocalyptic number.

It is an amenable number.

7123128 is an abundant number, since it is smaller than the sum of its proper divisors (10684752).

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

7123128 is a wasteful number, since it uses less digits than its factorization.

7123128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296806 (or 296802 counting only the distinct ones).

The product of its digits is 672, while the sum is 24.

The square root of 7123128 is about 2668.9188822443. The cubic root of 7123128 is about 192.4082027038.

The spelling of 7123128 in words is "seven million, one hundred twenty-three thousand, one hundred twenty-eight".