189038387 has 2 divisors, whose sum is σ = 189038388. Its totient is φ = 189038386.

The previous prime is 189038383. The next prime is 189038401. The reversal of 189038387 is 783830981.

It is a weak prime.

It is an emirp because it is prime and its reverse (783830981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189038387 - 2² = 189038383 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (189038383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94519193 + 94519194.

It is an arithmetic number, because the mean of its divisors is an integer number (94519194).

Almost surely, 2^189038387 is an apocalyptic number.

189038387 is a deficient number, since it is larger than the sum of its proper divisors (1).

189038387 is an equidigital number, since it uses as much as digits as its factorization.

189038387 is an evil number, because the sum of its binary digits is even.

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

The square root of 189038387 is about 13749.1231356767. The cubic root of 189038387 is about 573.9182049473.

The spelling of 189038387 in words is "one hundred eighty-nine million, thirty-eight thousand, three hundred eighty-seven".