189081478 has 4 divisors (see below), whose sum is σ = 283622220. Its totient is φ = 94540738.

The previous prime is 189081457. The next prime is 189081481. The reversal of 189081478 is 874180981.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47270368 + ... + 47270371.

It is an arithmetic number, because the mean of its divisors is an integer number (70905555).

Almost surely, 2^189081478 is an apocalyptic number.

189081478 is a deficient number, since it is larger than the sum of its proper divisors (94540742).

189081478 is an equidigital number, since it uses as much as digits as its factorization.

189081478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94540741.

The product of its (nonzero) digits is 129024, while the sum is 46.

The square root of 189081478 is about 13750.6900917736. The cubic root of 189081478 is about 573.9618095486.

The spelling of 189081478 in words is "one hundred eighty-nine million, eighty-one thousand, four hundred seventy-eight".