188890047 has 6 divisors (see below), whose sum is σ = 272841192. Its totient is φ = 125926692.

The previous prime is 188890003. The next prime is 188890057. The reversal of 188890047 is 740098881.

It is not a de Polignac number, because 188890047 - 2⁷ = 188889919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 188889984 and 188890011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188890057) 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 5 ways as a sum of consecutive naturals, for example, 10493883 + ... + 10493900.

It is an arithmetic number, because the mean of its divisors is an integer number (45473532).

Almost surely, 2^188890047 is an apocalyptic number.

188890047 is a deficient number, since it is larger than the sum of its proper divisors (83951145).

188890047 is a wasteful number, since it uses less digits than its factorization.

188890047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20987789 (or 20987786 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 188890047 is about 13743.7275511413. The cubic root of 188890047 is about 573.7680461950.

The spelling of 188890047 in words is "one hundred eighty-eight million, eight hundred ninety thousand, forty-seven".