187900045 has 4 divisors (see below), whose sum is σ = 225480060. Its totient is φ = 150320032.

The previous prime is 187900039. The next prime is 187900049. The reversal of 187900045 is 540009781.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 540009781 = 43 ⋅12558367.

It can be written as a sum of positive squares in 2 ways, for example, as 119705481 + 68194564 = 10941^2 + 8258^2 .

It is a cyclic number.

It is not a de Polignac number, because 187900045 - 2²⁵ = 154345613 is a prime.

It is a super-2 number, since 2×187900045² = 70612853822004050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187900049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18790000 + ... + 18790009.

It is an arithmetic number, because the mean of its divisors is an integer number (56370015).

Almost surely, 2^187900045 is an apocalyptic number.

It is an amenable number.

187900045 is a deficient number, since it is larger than the sum of its proper divisors (37580015).

187900045 is an equidigital number, since it uses as much as digits as its factorization.

187900045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37580014.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 187900045 is about 13707.6637323798. The cubic root of 187900045 is about 572.7638874222.

The spelling of 187900045 in words is "one hundred eighty-seven million, nine hundred thousand, forty-five".