7123545 has 96 divisors (see below), whose sum is σ = 15410304. Its totient is φ = 3110400.

The previous prime is 7123513. The next prime is 7123547. The reversal of 7123545 is 5453217.

It is a happy number.

It is not a de Polignac number, because 7123545 - 2⁵ = 7123513 is a prime.

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

7123545 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7123547) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 173725 + ... + 173765.

It is an arithmetic number, because the mean of its divisors is an integer number (160524).

Almost surely, 2^7123545 is an apocalyptic number.

It is an amenable number.

7123545 is an abundant number, since it is smaller than the sum of its proper divisors (8286759).

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

7123545 is a wasteful number, since it uses less digits than its factorization.

7123545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 73 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 7123545 is about 2668.9970026210. The cubic root of 7123545 is about 192.4119572648.

The spelling of 7123545 in words is "seven million, one hundred twenty-three thousand, five hundred forty-five".