38840393987 has 2 divisors, whose sum is σ = 38840393988. Its totient is φ = 38840393986.

The previous prime is 38840393957. The next prime is 38840394029. The reversal of 38840393987 is 78939304883.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 38840393987 - 2¹⁰ = 38840392963 is a prime.

It is not a weakly prime, because it can be changed into another prime (38840393947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19420196993 + 19420196994.

It is an arithmetic number, because the mean of its divisors is an integer number (19420196994).

Almost surely, 2^38840393987 is an apocalyptic number.

38840393987 is a deficient number, since it is larger than the sum of its proper divisors (1).

38840393987 is an equidigital number, since it uses as much as digits as its factorization.

38840393987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31352832, while the sum is 62.

The spelling of 38840393987 in words is "thirty-eight billion, eight hundred forty million, three hundred ninety-three thousand, nine hundred eighty-seven".