7123145 has 8 divisors (see below), whose sum is σ = 8565504. Its totient is φ = 5686704.

The previous prime is 7123117. The next prime is 7123159. The reversal of 7123145 is 5413217.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7123145 - 2¹⁰ = 7122121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7123145.

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 7 ways as a sum of consecutive naturals, for example, 1862 + ... + 4208.

It is an arithmetic number, because the mean of its divisors is an integer number (1070688).

Almost surely, 2^7123145 is an apocalyptic number.

It is an amenable number.

7123145 is a deficient number, since it is larger than the sum of its proper divisors (1442359).

7123145 is a wasteful number, since it uses less digits than its factorization.

7123145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2959.

The product of its digits is 840, while the sum is 23.

The square root of 7123145 is about 2668.9220670525. The cubic root of 7123145 is about 192.4083557703.

The spelling of 7123145 in words is "seven million, one hundred twenty-three thousand, one hundred forty-five".