189038391 has 32 divisors (see below), whose sum is σ = 271514880. Its totient is φ = 116640000.

The previous prime is 189038387. The next prime is 189038401. The reversal of 189038391 is 193830981.

It is a happy number.

It is not a de Polignac number, because 189038391 - 2² = 189038387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189038321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 753016 + ... + 753266.

It is an arithmetic number, because the mean of its divisors is an integer number (8484840).

Almost surely, 2^189038391 is an apocalyptic number.

189038391 is a deficient number, since it is larger than the sum of its proper divisors (82476489).

189038391 is a wasteful number, since it uses less digits than its factorization.

189038391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 189038391 is about 13749.1232811405. The cubic root of 189038391 is about 573.9182089953.

The spelling of 189038391 in words is "one hundred eighty-nine million, thirty-eight thousand, three hundred ninety-one".