187699045 has 4 divisors (see below), whose sum is σ = 225238860. Its totient is φ = 150159232.

The previous prime is 187699033. The next prime is 187699073. The reversal of 187699045 is 540996781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 540996781 = 13 ⋅41615137.

It can be written as a sum of positive squares in 2 ways, for example, as 25060036 + 162639009 = 5006^2 + 12753^2 .

It is a cyclic number.

It is not a de Polignac number, because 187699045 - 2¹⁷ = 187567973 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 187699045.

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 in 3 ways as a sum of consecutive naturals, for example, 18769900 + ... + 18769909.

It is an arithmetic number, because the mean of its divisors is an integer number (56309715).

Almost surely, 2^187699045 is an apocalyptic number.

It is an amenable number.

187699045 is a deficient number, since it is larger than the sum of its proper divisors (37539815).

187699045 is an equidigital number, since it uses as much as digits as its factorization.

187699045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37539814.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 187699045 is about 13700.3301055121. The cubic root of 187699045 is about 572.5595826700.

The spelling of 187699045 in words is "one hundred eighty-seven million, six hundred ninety-nine thousand, forty-five".