43138125 has 30 divisors (see below), whose sum is σ = 77873510. Its totient is φ = 23004000.

The previous prime is 43138111. The next prime is 43138127. The reversal of 43138125 is 52183134.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 6487209 + 36650916 = 2547^2 + 6054^2 .

It is not a de Polignac number, because 43138125 - 2¹¹ = 43136077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43138127) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1791 + ... + 9459.

Almost surely, 2^43138125 is an apocalyptic number.

43138125 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

43138125 is a deficient number, since it is larger than the sum of its proper divisors (34735385).

43138125 is an equidigital number, since it uses as much as digits as its factorization.

43138125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7695 (or 7677 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 43138125 is about 6567.9620126794. The cubic root of 43138125 is about 350.7145266922.

The spelling of 43138125 in words is "forty-three million, one hundred thirty-eight thousand, one hundred twenty-five".