4138987 has 2 divisors, whose sum is σ = 4138988. Its totient is φ = 4138986.

The previous prime is 4138969. The next prime is 4138993. The reversal of 4138987 is 7898314.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4138987 - 2¹¹ = 4136939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4138957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2069493 + 2069494.

It is an arithmetic number, because the mean of its divisors is an integer number (2069494).

Almost surely, 2^4138987 is an apocalyptic number.

4138987 is a deficient number, since it is larger than the sum of its proper divisors (1).

4138987 is an equidigital number, since it uses as much as digits as its factorization.

4138987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 40.

The square root of 4138987 is about 2034.4500485389. The cubic root of 4138987 is about 160.5577798134.

The spelling of 4138987 in words is "four million, one hundred thirty-eight thousand, nine hundred eighty-seven".