187640893 has 4 divisors (see below), whose sum is σ = 204699168. Its totient is φ = 170582620.

The previous prime is 187640833. The next prime is 187640927. The reversal of 187640893 is 398046781.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 398046781 = 11 ⋅36186071.

It is a cyclic number.

It is not a de Polignac number, because 187640893 - 2¹³ = 187632701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187640813) 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, 8529121 + ... + 8529142.

It is an arithmetic number, because the mean of its divisors is an integer number (51174792).

Almost surely, 2^187640893 is an apocalyptic number.

It is an amenable number.

187640893 is a deficient number, since it is larger than the sum of its proper divisors (17058275).

187640893 is a wasteful number, since it uses less digits than its factorization.

187640893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17058274.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 187640893 is about 13698.2076564783. The cubic root of 187640893 is about 572.5004473595.

The spelling of 187640893 in words is "one hundred eighty-seven million, six hundred forty thousand, eight hundred ninety-three".