7125921 has 16 divisors (see below), whose sum is σ = 11517120. Its totient is φ = 4318560.

The previous prime is 7125901. The next prime is 7125947. The reversal of 7125921 is 1295217.

7125921 is a `hidden beast` number, since 71 + 2 + 592 + 1 = 666.

It is not a de Polignac number, because 7125921 - 2⁵ = 7125889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

7125921 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7125901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11700 + ... + 12293.

It is an arithmetic number, because the mean of its divisors is an integer number (719820).

Almost surely, 2^7125921 is an apocalyptic number.

It is an amenable number.

7125921 is a deficient number, since it is larger than the sum of its proper divisors (4391199).

7125921 is a wasteful number, since it uses less digits than its factorization.

7125921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24013 (or 24007 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 7125921 is about 2669.4420765396. The cubic root of 7125921 is about 192.4333473634.

The spelling of 7125921 in words is "seven million, one hundred twenty-five thousand, nine hundred twenty-one".