40138687 has 2 divisors, whose sum is σ = 40138688. Its totient is φ = 40138686.

The previous prime is 40138661. The next prime is 40138699. The reversal of 40138687 is 78683104.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40138687 is a prime.

It is a super-2 number, since 2×40138687² = 3222228388167938, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40138607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20069343 + 20069344.

It is an arithmetic number, because the mean of its divisors is an integer number (20069344).

Almost surely, 2^40138687 is an apocalyptic number.

40138687 is a deficient number, since it is larger than the sum of its proper divisors (1).

40138687 is an equidigital number, since it uses as much as digits as its factorization.

40138687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 40138687 is about 6335.5100031489. The cubic root of 40138687 is about 342.3899858003.

The spelling of 40138687 in words is "forty million, one hundred thirty-eight thousand, six hundred eighty-seven".