38131787 has 2 divisors, whose sum is σ = 38131788. Its totient is φ = 38131786.

The previous prime is 38131729. The next prime is 38131789. The reversal of 38131787 is 78713183.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38131787 is a prime.

Together with 38131789, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38131787.

It is not a weakly prime, because it can be changed into another prime (38131789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19065893 + 19065894.

It is an arithmetic number, because the mean of its divisors is an integer number (19065894).

Almost surely, 2^38131787 is an apocalyptic number.

38131787 is a deficient number, since it is larger than the sum of its proper divisors (1).

38131787 is an equidigital number, since it uses as much as digits as its factorization.

38131787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 38.

The square root of 38131787 is about 6175.0940883520. The cubic root of 38131787 is about 336.5857454546.

The spelling of 38131787 in words is "thirty-eight million, one hundred thirty-one thousand, seven hundred eighty-seven".