38891389 has 2 divisors, whose sum is σ = 38891390. Its totient is φ = 38891388.

The previous prime is 38891387. The next prime is 38891399. The reversal of 38891389 is 98319883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29484900 + 9406489 = 5430^2 + 3067^2 .

It is a cyclic number.

It is not a de Polignac number, because 38891389 - 2¹ = 38891387 is a prime.

Together with 38891387, it forms a pair of twin primes.

It is a congruent number.

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, 19445694 + 19445695.

It is an arithmetic number, because the mean of its divisors is an integer number (19445695).

Almost surely, 2^38891389 is an apocalyptic number.

It is an amenable number.

38891389 is a deficient number, since it is larger than the sum of its proper divisors (1).

38891389 is an equidigital number, since it uses as much as digits as its factorization.

38891389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 49.

The square root of 38891389 is about 6236.2960962417. The cubic root of 38891389 is about 338.8060457460.

The spelling of 38891389 in words is "thirty-eight million, eight hundred ninety-one thousand, three hundred eighty-nine".