186420493 has 4 divisors (see below), whose sum is σ = 213052000. Its totient is φ = 159788988.

The previous prime is 186420491. The next prime is 186420503. The reversal of 186420493 is 394024681.

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: 394024681 = 61 ⋅6459421.

It is a cyclic number.

It is not a de Polignac number, because 186420493 - 2¹ = 186420491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (186420491) by changing a digit.

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, 13315743 + ... + 13315756.

It is an arithmetic number, because the mean of its divisors is an integer number (53263000).

Almost surely, 2^186420493 is an apocalyptic number.

It is an amenable number.

186420493 is a deficient number, since it is larger than the sum of its proper divisors (26631507).

186420493 is an equidigital number, since it uses as much as digits as its factorization.

186420493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26631506.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 186420493 is about 13653.5890153468. The cubic root of 186420493 is about 571.2565824631.

The spelling of 186420493 in words is "one hundred eighty-six million, four hundred twenty thousand, four hundred ninety-three".