189888438 has 16 divisors (see below), whose sum is σ = 380262960. Its totient is φ = 63215136.

The previous prime is 189888409. The next prime is 189888467. The reversal of 189888438 is 834888981.

It is an interprime number because it is at equal distance from previous prime (189888409) and next prime (189888467).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15073 + ... + 24636.

It is an arithmetic number, because the mean of its divisors is an integer number (23766435).

Almost surely, 2^189888438 is an apocalyptic number.

189888438 is an abundant number, since it is smaller than the sum of its proper divisors (190374522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189888438 is a wasteful number, since it uses less digits than its factorization.

189888438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40511.

The product of its digits is 3538944, while the sum is 57.

The square root of 189888438 is about 13780.0013788098. The cubic root of 189888438 is about 574.7771668374. Note that the first 3 decimals are identical.

The spelling of 189888438 in words is "one hundred eighty-nine million, eight hundred eighty-eight thousand, four hundred thirty-eight".