186428994 has 32 divisors (see below), whose sum is σ = 394701120. Its totient is φ = 58602432.

The previous prime is 186428981. The next prime is 186429011. The reversal of 186428994 is 499824681.

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 in 15 ways as a sum of consecutive naturals, for example, 4977 + ... + 19940.

It is an arithmetic number, because the mean of its divisors is an integer number (12334410).

Almost surely, 2^186428994 is an apocalyptic number.

186428994 is an abundant number, since it is smaller than the sum of its proper divisors (208272126).

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

186428994 is a wasteful number, since it uses less digits than its factorization.

186428994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24994.

The product of its digits is 995328, while the sum is 51.

The square root of 186428994 is about 13653.9003218861. The cubic root of 186428994 is about 571.2652656615.

The spelling of 186428994 in words is "one hundred eighty-six million, four hundred twenty-eight thousand, nine hundred ninety-four".