43138987 has 8 divisors (see below), whose sum is σ = 45469760. Its totient is φ = 40814280.

The previous prime is 43138981. The next prime is 43139023. The reversal of 43138987 is 78983134.

It is a happy number.

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

It is not a de Polignac number, because 43138987 - 2⁷ = 43138859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43138981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27412 + ... + 28942.

It is an arithmetic number, because the mean of its divisors is an integer number (5683720).

Almost surely, 2^43138987 is an apocalyptic number.

43138987 is a deficient number, since it is larger than the sum of its proper divisors (2330773).

43138987 is a wasteful number, since it uses less digits than its factorization.

43138987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033.

The product of its digits is 145152, while the sum is 43.

The square root of 43138987 is about 6568.0276339248. The cubic root of 43138987 is about 350.7168627071.

The spelling of 43138987 in words is "forty-three million, one hundred thirty-eight thousand, nine hundred eighty-seven".