43138187 has 4 divisors (see below), whose sum is σ = 43684320. Its totient is φ = 42592056.

The previous prime is 43138181. The next prime is 43138213. The reversal of 43138187 is 78183134.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78183134 = 2 ⋅39091567.

It is a cyclic number.

It is not a de Polignac number, because 43138187 - 2⁸ = 43137931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43138181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272948 + ... + 273105.

It is an arithmetic number, because the mean of its divisors is an integer number (10921080).

Almost surely, 2^43138187 is an apocalyptic number.

43138187 is a deficient number, since it is larger than the sum of its proper divisors (546133).

43138187 is an equidigital number, since it uses as much as digits as its factorization.

43138187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546132.

The product of its digits is 16128, while the sum is 35.

The square root of 43138187 is about 6567.9667325589. The cubic root of 43138187 is about 350.7146947129.

The spelling of 43138187 in words is "forty-three million, one hundred thirty-eight thousand, one hundred eighty-seven".