38891387 has 2 divisors, whose sum is σ = 38891388. Its totient is φ = 38891386.

The previous prime is 38891383. The next prime is 38891389. The reversal of 38891387 is 78319883.

It is a strong prime.

It is an emirp because it is prime and its reverse (78319883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38891387 - 2² = 38891383 is a prime.

It is a super-3 number, since 3×38891387³ (a number of 24 digits) contains 333 as substring.

Together with 38891389, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38891383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19445693 + 19445694.

It is an arithmetic number, because the mean of its divisors is an integer number (19445694).

Almost surely, 2^38891387 is an apocalyptic number.

38891387 is a deficient number, since it is larger than the sum of its proper divisors (1).

38891387 is an equidigital number, since it uses as much as digits as its factorization.

38891387 is an evil number, because the sum of its binary digits is even.

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

The square root of 38891387 is about 6236.2959358901. The cubic root of 38891387 is about 338.8060399383.

The spelling of 38891387 in words is "thirty-eight million, eight hundred ninety-one thousand, three hundred eighty-seven".