38913887 has 2 divisors, whose sum is σ = 38913888. Its totient is φ = 38913886.

The previous prime is 38913877. The next prime is 38913937. The reversal of 38913887 is 78831983.

It is a weak prime.

It is an emirp because it is prime and its reverse (78831983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38913887 - 2⁴ = 38913871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38913817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19456943 + 19456944.

It is an arithmetic number, because the mean of its divisors is an integer number (19456944).

Almost surely, 2^38913887 is an apocalyptic number.

38913887 is a deficient number, since it is larger than the sum of its proper divisors (1).

38913887 is an equidigital number, since it uses as much as digits as its factorization.

38913887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 47.

The square root of 38913887 is about 6238.0996304965. The cubic root of 38913887 is about 338.8713643102.

The spelling of 38913887 in words is "thirty-eight million, nine hundred thirteen thousand, eight hundred eighty-seven".